AllocateNewObject instead of NewInstance?
I am working on a Java development tool that requires instantiation of arbitrary classes using reflection. My tool needs to be able to instantiate an object of any class, just as deSerialization does. Any ideas on how to do this would be greatly appreciated.
Reflection doesn't allow this because it can only instantiate classes with no-arg constructors. Using reflected constructors with arguments is useless since unwanted side-effects could be produced. (In my opinion this is a major mistake in reflection).
I checked the code for deSerialization and it uses the native call allocateNewObject. I tried to use this call also, but I don't know what library it is in. I suspect the call is somehow built into the VM (I'm quite ignorant in this area). There shouldn't be any security issue since my tool will be installed as an extension.
Can someone please tell me how to do this? It doesn't seem fair that deSerialization can do this and I cannot in my tool.
mchahn said
allocateNewObject DOES return a reference to the newly created empty object...it is easy to understand... It does look easy.
And tracing through the code for allocateNewObject, it is obvious that it does call a constructor, the no-arg constructor. Any path that does not find the no-arg constructor results in an exception.
At least that is what I get from JVM_AllocateNewObject()
mchahn said
not one that has run a constructor of any kind One would hope that wasn't possible. A constructor says that an object is 'ready for use'. Java, unlike C++, is based on the premise that it is impossible to create objects in such a way that they might be half way constructed.
There is a JNI method that allows you to allocate an object without calling the constructor. However, if you try to do anything with that object, except call the constructor, you will get an error. From my point of view this is a good thing.
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A suggestion : use "loop array list" instead of ArrayList / LinkedList
ArrayList is good at:
get / set by index : O(1)
appending : O(log(n))
remove last : O(1)
and very bad at:
add middle : O(n)
remove from middle : O(n)
LinkedList is good at:
fast remove from middle, if your iteraror already goes there : O(1)
convenient methods : addFirst, addLast, removeFirst, removeLast : O(1)
and very bad at :
get / set by index : O(n)
here I want to make a suggestion : use "loop array list" instead of the ArrayList and LinkedList.
a "loop array list" is based on array, just like ArrayList. But it has 2 member-variables : the start position, and the real size. the start position can be anywhere within array.length. an element of index "i" is stored in array[ start + i ], and when (start + i > array.length), loop to the beginning of the array; when (start + i < 0), loop to the end of the array.
this "loop array list" has all the good sides:
get / set by index : O(1)
add first / last : O(log(n))
remove first / last : O(log(n))
add / remove from middle : O(n)
(note : because we shrink the backup-array when the real size is too small, add / remove operation take O(log(n)) now.)
the only problem is : add / remove from middle. let's take a look at it.
1. the LinkedList does NOT really add/remove from middle in O(1), you has to locate the element, which is O(n).
2. O(n) is acceptable, O(n^2) is not acceptable. try this : keep removing first element from an very big ArrayList ( size>10^6 ) until it's empty.
the fact is, any list can perform batch-remove / batch-add operation in O(n) instead of O(n^2). it's easy : allocate a new list, iterate the original list, copy the element into the new list if condition is satisfied.
so, instead of "remove from middle", what we need is a new methods : removeAllByCondition( Condition condition ), and now the batch-remove operation can be done in O(n)
here is an implementation of mine. I've tested it on my computer( 512mem + 2G cpu, win2k + jdk1.5 ), it's amazing, just a little slower then ArrayList when add last, and a liitle slower then LinkedList when batch-remove. in all other cases, it's far more better then those 2 kinds of List.
// source code : List2
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Set;
public final class List2<T> extends AbstractList<T> {
private static int initialArrayLength = 4;
private T[] array;
private int start;
private int size;
private void init( T[] newArray, int start_a, int size_a ) {
array = newArray;
start = start_a;
size = size_a;
@SuppressWarnings("unchecked")
private void init() {
init( (T[]) new Object[ initialArrayLength ], 0, 0 );
public List2() {
init();
@SuppressWarnings("unchecked")
public List2( Collection<? extends T> collection ) {
init(
collection.toArray( (T[]) new Object[ collection.size() * 11 / 10 + 1 ] ),
0,
collection.size()
private List2( T[] array_a, int start_a, int size_a ) {
init( array_a, start_a, size_a );
@SuppressWarnings("unchecked")
public static <TT> List2<TT> createV( TT... elements ) {
TT[] array = (TT[]) new Object[ elements.length * 11 / 10 + 1 ];
System.arraycopy( elements, 0, array, 0, elements.length );
return new List2<TT>( array, 0, elements.length );
public static List2<Double> create( double... elements ) {
Double[] array = new Double[ elements.length * 11 / 10 + 1 ];
for( int i=0; i < elements.length; i++ )
array[i] = elements;
return new List2<Double>( array, 0, elements.length );
public static List2<Integer> create( int... elements ) {
Integer[] array2 = new Integer[ elements.length * 11 / 10 + 1 ];
for( int i=0; i < elements.length; i++ )
array2[i] = elements[i];
return new List2<Integer>( array2, 0, elements.length );
public static List2<Character> create( char... elements ) {
Character[] array2 = new Character[ elements.length * 11 / 10 + 1 ];
for( int i=0; i < elements.length; i++ )
array2[i] = elements[i];
return new List2<Character>( array2, 0, elements.length );
public static List2<Character> create( String s ) {
return create( s.toCharArray() );
public List2<T> clone() {
return new List2<T>( this );
// basic
public int size() {
return size;
private int index( int index ) {
int i = start + index;
if( i >= array.length )
i -= array.length;
return i;
public T get( int d ) {
if( d < 0 || d >= size )
throw new IndexOutOfBoundsException();
if( size == 0 )
throw new NoSuchElementException();
return array[ index( d ) ];
public T set( int index, T element ) {
if( index < 0 || index >= size )
throw new IndexOutOfBoundsException();
int i = index( index );
T oldElement = array[i];
array[i] = element;
return oldElement;
@SuppressWarnings("unchecked")
private void copyAndSetToNewArray( int newArrayLength ) {
T[] newArray = (T[]) new Object[ newArrayLength ];
for( int i=0; i<size; i++ )
newArray[i] = array[ index( i ) ];
init( newArray, 0, size );
public void addFirst( T element ) {
if( size == array.length )
copyAndSetToNewArray( size * 3 / 2 + 1 );
int i = index( array.length - 1 );
array[ i ] = element;
start = i;
size++;
public void addLast( T element ) {
if( size == array.length )
copyAndSetToNewArray( size * 3 / 2 + 1 );
array[ index( size ) ] = element;
size++;
public T removeFirst() {
if( size == 0 )
throw new NoSuchElementException();
T oldElement = array[ start ];
array[ start ] = null;
start = index( 1 );
size--;
if( array.length > size * 2 + 1 )
copyAndSetToNewArray( size * 11 / 10 + 1 );
return oldElement;
public T removeLast() {
if( size == 0 )
throw new NoSuchElementException();
int i = index( size - 1 );
T oldElement = array[i];
array[i] = null;
size--;
if( array.length > size * 2 + 1 )
copyAndSetToNewArray( size * 11 / 10 + 1 );
return oldElement;
@SuppressWarnings("unchecked")
public int removeAll( ListCondition<T> condition ) {
T[] newArray = (T[]) new Object[ array.length ];
int iNew = 0;
for( int i=0; i < size; i++ ) {
T element = get( i );
if( ! condition.isConditionSatisfied( this, i, element ) )
newArray[ iNew++ ] = element;
int oldSize = size;
init( newArray, 0, iNew );
if( array.length > size * 2 + 1 )
copyAndSetToNewArray( size * 11 / 10 + 1 );
return size - oldSize;
// aux
public boolean equals(Object obj) {
if( obj == this )
return true;
if( obj instanceof List2 ) {
List2 that = (List2) obj;
if( this.size != that.size )
return false;
for( int i=0; i < size; i++ )
if( ! Tools.equals( this.array[ this.index(i) ], that.array[ that.index(i) ] ) )
return false;
return true;
if( obj instanceof List ) {
List that = (List) obj;
if( this.size != that.size() )
return false;
Iterator thatIter = that.iterator();
for( int i=0; i < size; i++ )
if( ! Tools.equals( this.array[ this.index(i) ], thatIter.next() ) )
return false;
return true;
return true;
public int hashCode() {
int hashCode = 1;
for( int i=0; i < size; i++ ) {
T element = array[ index( i ) ];
hashCode = 31*hashCode + ( element==null ? 0 : element.hashCode() );
return hashCode;
public boolean isEmpty() {
return size == 0;
public T getFirst() {
return get( 0 );
public T getLast() {
return get( size() - 1 );
public T getRandom() {
return get( (int) (Math.random() * size) );
public int indexOf( Object element ) {
for( int i=0; i < size; i++ )
if( Tools.equals( array[ index( i ) ], element ) )
return i;
return -1;
public int lastIndexOf( Object element ) {
for( int i=size-1; i >= 0; i-- )
if( Tools.equals( array[ index( i ) ], element ) )
return i;
return -1;
public boolean contains( Object element ) {
return indexOf( element ) != -1;
public boolean add( T element ) {
addLast( element );
return true;
@Deprecated
public void add( int index, T element ) {
throw new UnsupportedOperationException();
public T remove() {
return removeFirst();
@Deprecated
public boolean remove( Object element ) {
throw new UnsupportedOperationException( "use removeAll( Condition ) instead" );
@Deprecated
public T remove( int index ) {
throw new UnsupportedOperationException( "use removeAll( Condition ) instead" );
public void clear() {
init();
public Object[] toArray() {
Object[] result = new Object[ size ];
for( int i=0; i < size; i++ )
result[i] = array[ index( i ) ];
return result;
@SuppressWarnings("unchecked")
public <TT> TT[] toArray( TT[] a ) {
if( a.length < size )
a = (TT[]) java.lang.reflect.Array.newInstance( a.getClass().getComponentType(), size );
for( int i=0; i < size; i++ )
a[i] = (TT) array[ index( i ) ];
if( a.length > size )
a[size] = null;
return a;
@SuppressWarnings("unchecked")
public void sort() {
Object[] a = toArray();
Arrays.sort( a );
for( int i=0; i < size; i++ )
array[ i ] = (T) a[ i ];
start = 0;
@SuppressWarnings("unchecked")
public void sortDesc() {
Object[] a = toArray();
Arrays.sort( a );
for( int i=0, j=size-1; i < size; i++, j-- )
array[ i ] = (T) a[ j ];
start = 0;
@SuppressWarnings("unchecked")
public void sort( Comparator<T> comparator ) {
T[] a = (T[]) toArray();
Arrays.sort( a, comparator );
for( int i=0; i < size; i++ )
array[ i ] = a[ i ];
start = 0;
@SuppressWarnings("unchecked")
public void sortDesc( Comparator<T> comparator ) {
T[] a = (T[]) toArray();
Arrays.sort( a, comparator );
for( int i=0, j=size-1; i < size; i++, j-- )
array[ i ] = a[ j ];
start = 0;
public String toString( String delimiter ) {
return toString( "", delimiter, "", size() );
public String toString( String prefix, String delimiter, String suffix, int max ) {
StringBuffer stringBuffer = new StringBuffer( prefix );
int dest = Math.min( max, size );
for( int i=0; i < dest; i++ ) {
stringBuffer.append( get(i) );
if( i < dest - 1 )
stringBuffer.append( delimiter );
if( size > max )
stringBuffer.append( "...(" ).append( size() - max ).append( " more)" );
stringBuffer.append( suffix );
return stringBuffer.toString();
// batch operation
public boolean containsAll( Collection<?> that ) {
Set<Object> thisSet = new HashSet<Object>( this );
for( Object element : that )
if( ! thisSet.contains( element ) )
return false;
return true;
@SuppressWarnings("unchecked")
public List2<T> subList( int fromIndex, int toIndex ) {
if( fromIndex < 0 || toIndex > size || toIndex < fromIndex )
throw new IndexOutOfBoundsException();
int newSize = toIndex - fromIndex;
T[] newArray = (T[]) new Object[ newSize * 11 / 10 + 1 ];
for( int i=fromIndex, iNew=0; i < toIndex; i++, iNew++ )
newArray[ iNew ] = array[ index( i ) ];
return new List2<T>( newArray, 0, newSize );
public void addV( T... that ) {
for( T element : that )
addLast( element );
public boolean addAll( Collection<? extends T> that ) {
for( T element : that )
addLast( element );
return ! that.isEmpty();
@Deprecated
public boolean addAll( int index, Collection<? extends T> c ) {
throw new UnsupportedOperationException();
public void removeRest( T element ) {
int position = lastIndexOf( element );
if( position == -1 )
return;
while( ! Tools.equals( element, removeLast() ) );
public void removeAllEquals( final T element ) {
removeAll( new ListCondition<T>() { public boolean isConditionSatisfied(List2 list, int index, T currentElement) {
return currentElement.equals( element );
public void removeAllBetween( final T from, final T to ) {
removeAll( new ListCondition<T>() {
@SuppressWarnings("unchecked")
public boolean isConditionSatisfied(List2 list, int index, T element) {
if( from != null && ((Comparable) from).compareTo( element ) > 0 )
return false;
if( to != null && ((Comparable) to).compareTo( element ) <= 0 )
return false;
return true;
public boolean retainAll( Collection<?> that ) {
final Set<Object> thatSet = new HashSet<Object>( that );
int removeCount = removeAll( new ListCondition<T>() { public boolean isConditionSatisfied(List2 list, int index, T element) {
return ! thatSet.contains( element );
return removeCount > 0;
public boolean removeAll( Collection<?> that ) {
final Set<Object> thatSet = new HashSet<Object>( that );
int removeCount = removeAll( new ListCondition<T>() { public boolean isConditionSatisfied(List2 list, int index, T element) {
return thatSet.contains( element );
return removeCount > 0;
// unit test
private static int maxTestCount = 1000 * 1000;
public static void unitTest() throws Exception {
// thest thoese methods for one time
Tools.ensureEquals( new List2(), new ArrayList() );
Tools.ensureNotEquals( List2.create( "abcde" ), new ArrayList() );
Tools.ensureNotEquals( List2.create( "abcde" ), List2.create( "abcdef" ) );
final List<Double> list1 = new ArrayList<Double>();
final List2<Double> list2 = new List2<Double>();
Runnable[] tasks = new Runnable[] {
// test those methods that do NOT change the list
new Runnable() { public void run() {
Tools.ensureEquals( new List2<Double>( list1 ), list1 );
Tools.ensureEquals( List2.createV( list1.toArray() ), list1 );
Tools.ensureEquals( List2.createV( list1.toArray( new Double[0] ) ), list1 );
double[] doubles = new double[ list1.size() ];
int i = 0;
for( double d : list1 )
doubles[i++] = d;
Tools.ensureEquals( List2.create( doubles ), list1 );
Tools.ensure( list1.isEmpty() == list2.isEmpty() );
Arrays.equals( list1.toArray(), list2.toArray() );
Tools.ensureEquals( list1, list2.clone() );
Double notExistElement = -2.0;
Tools.ensure( list1.indexOf( notExistElement ) == -1 );
Tools.ensure( list1.lastIndexOf( notExistElement ) == -1 );
Tools.ensure( list1.contains( notExistElement ) == false );
Tools.ensureEquals( list1.toString(), list2.toString() );
Tools.ensureEquals( list1.toString(), list2.toString() );
Tools.ensureEquals( list1.hashCode(), list2.hashCode() );
if( list1.isEmpty() )
return;
Tools.ensure( list1.get(0).equals( list2.getFirst() ) );
Tools.ensure( list1.get(list1.size()-1).equals( list2.getLast() ) );
Double existRandomElement = list2.getRandom();
Tools.ensure( list1.contains( existRandomElement ) );
Tools.ensure( list2.contains( existRandomElement ) );
Tools.ensure( list1.indexOf( existRandomElement ) == list2.indexOf( existRandomElement ) );
Tools.ensure( list1.indexOf( existRandomElement ) == list2.indexOf( existRandomElement ) );
int from = (int) (Math.random() * list1.size());
int to = (int) (Math.random() * (list1.size()+1));
if( from > to ) {
int t = from;
from = to;
to = t;
Tools.ensureEquals( list1.subList( from, to ), list2.subList( from, to ) );
// test those methods that change the list
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
int i = (int) (Math.random() * list1.size());
double d = Math.random();
list1.set( i, d );
list2.set( i, d );
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
int i = (int) (Math.random() * list1.size());
Tools.ensure( list1.get( i ).equals( list2.get( i ) ) );
new Runnable() { public void run() {
double d = Math.random();
list1.add( 0, d );
list2.addFirst( d );
new Runnable() { public void run() {
double d = Math.random();
list1.add( d );
list2.addLast( d );
new Runnable() { public void run() {
double d = Math.random();
list1.add( d );
list2.addLast( d );
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
Tools.ensure( list1.remove( 0 ).equals( list2.removeFirst() ) );
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
Tools.ensure( list1.remove( list1.size() - 1 ).equals( list2.removeLast() ) );
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
int i = 0;
for( Iterator<Double> iter=list1.iterator(); iter.hasNext(); i++ ) {
iter.next();
if( i % 3 == 0 )
iter.remove();
list2.removeAll( new ListCondition<Double>() { public boolean isConditionSatisfied(List2 list, int index, Double element) {
return index % 3 == 0;
new Runnable() { public void run() {
double d = Math.random();
list1.add( d );
list2.add( d );
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
Tools.ensure( list1.remove(0).equals( list2.remove() ) );
new Runnable() { public void run() {
if( list1.isEmpty() )
return;
int r = (int) (Math.random() * list1.size());
Double element = list1.get( r );
int index = list1.lastIndexOf( element );
for( int i=list1.size()-1; i>=index; i-- )
list1.remove( i );
list2.removeRest( element );
new Runnable() { public void run() {
list2.removeRest( Math.random() - 2 );
new Runnable() { public void run() {
list1.clear();
list2.clear();
new Runnable() { public void run() {
Collections.sort( list1 );
list2.sort();
new Runnable() { public void run() {
Collections.sort( list1 );
Collections.reverse( list1 );
list2.sortDesc();
new Runnable() { public void run() {
Comparator<Double> comparator = new Comparator<Double>() { public int compare(Double o1, Double o2) {
return o1.toString().substring(2).compareTo( o2.toString().substring(2) );
Collections.sort( list1, comparator );
list2.sort( comparator );
new Runnable() { public void run() {
Comparator<Double> comparator = new Comparator<Double>() { public int compare(Double o1, Double o2) {
return o1.toString().substring(2).compareTo( o2.toString().substring(2) );
Collections.sort( list1, comparator );
Collections.reverse( list1 );
list2.sortDesc( comparator );
new Runnable() { public void run() {
Double notExistElement = -2.0;
list2.removeAllEquals( notExistElement );
Tools.ensureEquals( list1, list2 );
list2.removeAllBetween( 0.5, 0.6 );
for( Iterator<Double> iter=list1.iterator(); iter.hasNext(); ) {
double d = iter.next();
if( d >= 0.5 && d < 0.6 )
iter.remove();
Tools.ensureEquals( list1, list2 );
System.out.print( "test List2 " );
for( int i=0; i < maxTestCount; i++ ) {
tasks[ (int) (Math.random() * tasks.length) ].run();
Tools.ensureEquals( list1, list2 );
if( i % (maxTestCount/10) == 0 )
System.out.print( "." );
System.out.println( " ok" );
// source code : ListCondition
public interface ListCondition<T> {
boolean isConditionSatisfied( List2 list, int index, T element );Hi,
I have the following statement:
private List list = new ArrayList();
why not use private ArrayList list = new
ArrayList()?
I know ArrayList implements List, so list has a wide
scope, right? What's the benefit?
Thanks,
JieBy using the interface you are not tied to a specific implementation.
Later, you may determine that using a LinkedList is more efficient to your specific code and then all you need to do is change the statement to:
private List list = new LinkedList();As long as you are not casting the list reference to ArrayList (or something along those lines) you would not need to change anything else. -
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at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doCommit(ActivateOperation.java:106)
at weblogic.deploy.internal.targetserver.operations.AbstractOperation.commit(AbstractOperation.java:323)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentCommit(DeploymentManager.java:844)
at weblogic.deploy.internal.targetserver.DeploymentManager.activateDeploymentList(DeploymentManager.java:1253)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleCommit(DeploymentManager.java:440)
at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.commit(DeploymentServiceDispatcher.java:163)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doCommitCallback(DeploymentReceiverCallbackDeliverer.java:181)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$100(DeploymentReceiverCallbackDeliverer.java:12)
at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$2.run(DeploymentReceiverCallbackDeliverer.java:67)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:516)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@70b01a for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Logger) (Caused by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@70b01a for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Logger))
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)
at org.apache.axis2.transport.http.AxisServlet.<clinit>(AxisServlet.java:83)
... 50 more
Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@70b01a for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Logger)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413)
at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)
... 54 more
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Logger
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructor0(Class.java:2699)
at java.lang.Class.getConstructor(Class.java:1657)
at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410)
... 55 moreThanksGo to Environments >> servers>> adminServer >> logging >> advanced
change the default JDK logging to log4j
by default weblogic provides two types of logging JDK and log4j -
What can i use instead of generics?
I have a peice of code which i am getting loads of problems with the only thing i can think of is that i am using generics, can somebody tell me another way to write this without using generics?
List<VidBean> videos = new ArrayList<VidBean>();yeah i tried that but now instead of the error from above i get 6 errors:
myBean.java [38:1] cannot resolve symbol
symbol : method forName (java.lang.String)
location: class Class
Class.forName("com.mysql.jdbc.Driver").newInstance();
^
myBean.java [71:1] incompatible types
found : java.util.ArrayList
required: List
List videos = new ArrayList();
^
myBean.java [73:1] cannot resolve symbol
symbol : class VidBean
location: class finderBean
VidBean video = new VidBean();
^
myBean.java [73:1] cannot resolve symbol
symbol : class VidBean
location: class finderBean
VidBean video = new VidBean();
^
myBean.java [74:1] cannot resolve symbol
symbol : method getInd (java.lang.String)
location: interface java.sql.ResultSet
video.setRecId(rs0.getInd("recording_id"));
^
myBean.java [86:1] cannot resolve symbol
symbol : variable stmt
location: class finderBean
stmt.close();
^
6 errors
Errors compiling myBean. -
DocumentBuilderFactory.newInstance(); OR TransformerFactory.newInstance();
Usually when we create a reference to an class, we'll do:
Test tst = new Test();
But when we create a DocumentBuilderFactory or a TransformerFactory, we use:
DocumentBuilderFactory.newInstance();
or
TransformerFactory.newInstance();
Why use the newInstance() instead?
Thanks
ScottThose are "factory" classes (as you might guess from their names). The DocumentBuilderFactory's newInstance() method returns an object that is an instance of DocumentBuilderFactory. If you read the documentation for the method, you will see the logic it goes through to decide which class it will produce an instance of.
This allows the user to configure the choice of DocumentBuilderFactory by changing the environment, rather than by having to modify source code and recompile. -
In the Monthly view of iCal the only events that show a color bar in the event is the Birthday Calendar. All other events in all my other calendars only show a color bullet next to the event (unless I click on that event which then shows as a color bar). I would like to know if it is possible for all the calendar events to have a color bar in the monthly view instead of just that tiny color bullet.
Greetings Judith,
Before making any attempts at deleting calendar data, backup what you have just in case:
Click on each calendar on the left hand side of iCal one at a time highlighting it's name and then going to File Export > Export and saving the resulting calendar file to a logical location for safekeeping.
iCal has an automated function located in iCal > Preferences > Advanced > Delete events "X" days after they have passed. By typing in a value for days you can tell iCal to delete all events before that time frame.
Example:
Today is 4-16-2012.
If I wanted to delete all events prior to 1 year ago (4-16-2011) I would type in "365" for the number of days.
Once you type in the number of days you want kept in iCal, close the preferences and then quit iCal.
Re-open iCal and check to see if the events are gone. If not you may want to leave it open for several minutes and then quit again.
Once the events are removed go back to iCal > Preferences > Advanced > Delete events "X" days after they have passed and make sure the check mark is removed to prevent future deletion.
Hope that helps. -
CD imported to wrong folder organization Album/Artist instead of Artist/Alb
I imported (ripped) a CD and the folder convention iTunes created in my music library was like this:
AlbumName/ArtistName
instead of
ArtistName/AlbumName
How could this happen. I have ripped hundreds of CD's and this is the first time it has happened. I am letting iTuned organize my files.
Any clues?
Thanks!Actually I know exactlty what bae77345 is referring to, because I am running into the same problem. Thus my search in the forums.
Usually Ive had no problem in importing a song into iTunes, and changing the song IN iTunes to read as follows.
Name of Song: DAYS `EUREKA OPENING MIX`
Artist: Anime
Album : Eureka seveN OST 1
Album artist: FLOW
And the Windown path would look like this
C:\Documents and Settings\Varxtis\My Documents\My Music\iTunes\iTunes Music\Anime\Eureka seveN OST 1\1-01 DAYS `EUREKA OPENING MIX`.mp3
Notice It goes Artist>Album>Song Title
Album Artist would not even be part of the path, which is exactly what I want.
but now it shows
C:\Documents and Settings\Varxtis\My Documents\My Music\iTunes\iTunes Music\FLOW\Eureka seveN OST 1\1-01 DAYS `EUREKA OPENING MIX`.mp3
Which goes AlbumArtist>Album>Song Title. it doesn't even include the artist as part of the path. How annoying.
It makes a HUGE difference to me because I need everything in "iTunes Music" library in windows to be pathed as Artist>Album: Song Title. I use a different MP3 Player so, it's almost impossible to have half one way (those that have albumartist) and half another (those that don't) BTW, Sorry apple. . .no Offense. I've had and loved an iPod. . . but it died and I got this as a gift.
I never changed any settings, and quite honestly it's been about a month since I had to update my MP3 player music (thus noticing the problem). So, there HAS to be a reason for it to change. And more importantly, a way to change it back.
Windows XP
Windows XP
Windows XP -
How do I add URI web link with custom tooltip like "CLICK HERE TO UPDATE" instead of URI web link in tooltip.
You've probably found an answer to this by now, but I think this has been addressed in another forum -- The link below suggested using a button and adding the tooltip to the button.
https://forums.adobe.com/thread/304974?start=0&tstart=0
Sounds like it would work but I haven't actually tried it.
Good luck~! -
I have a multi-select parameter that can have a list of thousands of entries. In general, the user will pick a few entries from the list or "Select All". If they check "Select All", I would much prefer that I get a NULL or an empty string
instead of a list of all values. Is there any way to do that?
In experimenting with a work-around, I tried putting an "All" label with a null value in the list, but it is ignored (does not display in the drop-down). If I use an empty string for the value, my "All" entry does get displayed, but so
does "Select All", which is confusing. Is there a way to suppress "Select All"?
- MarkI adapted the following from a workaround posted by JNeo on 4/16/2010 at 11:14 AM at
http://connect.microsoft.com/SQLServer/feedback/details/249227/multi-value-select-all-parameter-in-reporting-services
To get a null value instead of the full list of all values when "Select All" is chosen:
1) Add a multi-value parameter "MyParam" that lists the values to choose.
2) Add a DataSet "ParamCount" identical to the one used by "MyParam", except that it returns a single column named [Count] that is a COUNT(*) of the same data
3) Add a parameter "MyParamCount", set it to hidden and internal, then set the default value to 'Get values from a query', choosing "ParamCount" for the Dataset and the one [Count] column for the Value field.
4) Change the parameter for the main report DataSet so that instead of using [@MyParam], it uses this expression:
=IIF(Parameters!MyParam.Count =
Parameters!ParamCount.Value, Nothing, Join(Parameters!MyParam.Value, ",")) -
When I login to Horizon View, it shows me the list of desktops to connect to. If I'm entitled to only one desktop then can View auto connect me to that desktop instead of me clicking on Connect.
Yes you certainly can.
Right click any desktop in the list > Settings > in the left pane select the desktop you want to auto connect to > check "Auto connect to this desktop". -
Mini DVI to VGA incorrectly shipped with MBP instead of DVI to VGA
Has anyone else had a mini DVI to VGA adapter shipped with their macbook pro (2008) instead of a DVI to VGA adapter? I just needed to use it today and was told at the apple store that I had an adapter included with the computer. I went home to check and the adapter that was with the computer was a mini DVI to VGA adapter and the computer has a regular DVI output. I understand that later in 2008 the mac book pros were made with the mini DVI so I am thinking that there may have been a packaging error.......unusual for Apple???
Hi Tingrin,
Most likely an error when the machine was packaged for distribution. The MacBook Pro has never shipped with Mini DVI, it was a dual link DVI port until they went to Mini DisplayPort. The MacBook, however featured the Mini DVI.
I know Apple has ceased to ship the adapters with the MacBook Pro, to my knowledge they did around the time of the mid/late 2008 machines. I know with the first couple of generations (MBP) you actually got both a DVI and VGA adapter.
I'd contact Apple, inform of the discrepancy and I'm sure they'll make it right. -
Hello, I have been having issues with my iPhone 5C for about a month now. I have unlimited everything, including data, & so randomly, starting about 2 weeks ago, my data basically does not work for any apps, besides like iMessage & Safari. So like if I have full LTE signal, I can try to open the Instagram app, and it will tell me "no internet connection", & it tells me that with ANY app, besides iMessage & Safari. Which is super frustrating, especially when I try to use like Maps or something & it jut does not load, & tells me that "there is not an internet connection", so I have to use apps & stuff only on wifi, in order for them to work. I went to the Sprint store, and had them try and update the data profile, reset data network, soft reset, etc (they basically did everything that I did), & they could NOT figure out what was wrong with my phone. So, they looked into my warranty information, and told me to take my phone to the Apple Store, and just get a replacement & that it would cost me only $50, since it is still covered under warranty. I am not up for an upgrade until April of 2016, & as far as I know, when it comes to replacements, Apple will either give me a new/refurbished iPhone 5C as a replacement. I don't really mind having to pay a little extra if I have to, in order to get a 5S , & I also don't care if the 5S would be either new or refurbished. So, my question is, could I maybe get a 5S as a replacement, instead of another 5C?
Green iPhone 5C 8GB Sprint
Message was edited by: jalyn_taylor
Message was edited by: jalyn_taylorNo.
As provided, you will get the exact same model, storage, color, etc -
Discoverer report showing null instead blank
hi,
I am running report from discoverer and it is showing null instead blank, do I need to check some thing in pref.txt file in oracle 9i
regards
kumarhi,
I am running report from discoverer and it is showing null instead blank, do I need to check some thing in pref.txt file in oracle 9i
regards
kumar -
OS is Windows 7
I updated iTunes the other day and I decided to run "get album art" and instead of finding artwork, it made some of the artwork I already had show up as white squares, or disapear entirely. The ones that are white squares show up under the get info, but not in itunes. I did click in view for show al artwork, no luck. Many of these albums I bought from iTunes. The ones that the artwork was deleted some albums I can buy on iTunes, but already owned, and iTunes found the artwork before, but now cannot. Some are albums that I spent many hours finding and adding the artwork myself. I am very frustrated. I cannot find the time to manually install artwork for thousands of songs.
My work computer is Windows 8, so I really don't want to hear windows vs OSX argument. My company won't switch to mac because you like it better, so I just need a solution to my issue. iTunes it has always worked better for me on my work PC than my macBook, I dont know why, but I don't take two laptops with me when I travel so I have my iTunes library on the PC that has to come with me. This is the first time an update has screwed things up for me.Well my first guess was wrong. The line that failed is the one that writes out the image to disk. I've not revisited the code for that script for ages, but it seems I did add in an extra test for missing files a little while later, then forgot to upload the change. I can reproduce the error message if I deliberately rename a file to confuse iTunes so that seems the most likely reason for your problem with the script. I've uploaded a new build of CreateFolderArt which should work better.
See FindTracks for a tool to repair broken links. You should probably get that issue fixed first.
I know what SPSS stands for but that is all I know about it.
tt2
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