NullPointer when calling CLOB.createTemporary()

Hi all,
I am trying to insert an xml of size more than 4k into an xml type table. Given below is the code i am using to create the CLOB to insert the same.
I am getting a NullPointerException while creating the CLOB.
Please help me out here!!
CODE
private CLOB getCLOB(String xmlData, Connection conn) throws SQLException {
          CLOB tempClob = null;
          try {
               System.out.println("xml : ### : " + xmlData);
               // If the temporary CLOB has not yet been created, create new
               tempClob = CLOB.createTemporary(conn, true, CLOB.DURATION_CALL);
               // Open the temporary CLOB in readwrite mode to enable writing
               tempClob.open(CLOB.MODE_READWRITE);
               // Get the output stream to write
               Writer tempClobWriter = tempClob.getCharacterOutputStream();
               // Write the data into the temporary CLOB
               tempClobWriter.write(xmlData);
               // Flush and close the stream
               tempClobWriter.flush();
               tempClobWriter.close();
               // Close the temporary CLOB
               tempClob.close();
          } catch (SQLException sqlexp) {
               // tempClob.freeTemporary();
               sqlexp.printStackTrace();
          } catch (Exception exp) {
               // tempClob.freeTemporary();
               exp.printStackTrace();
          return tempClob;
STACK TRACE
java.lang.NullPointerException
     at oracle.sql.LobPlsqlUtil.plsql_createTemporaryLob(LobPlsqlUtil.java:1354)
     at oracle.jdbc.dbaccess.DBAccess.createTemporaryLob(DBAccess.java:997)
     at oracle.sql.LobDBAccessImpl.createTemporaryClob(LobDBAccessImpl.java:240)
     at oracle.sql.CLOB.createTemporary(CLOB.java:527)
     at com.cx.hcm.ams.slatingms.impl.dao.SlatingDAOImpl.getCLOB(SlatingDAOImpl.java:1359)
     at com.cx.hcm.ams.slatingms.impl.dao.SlatingDAOImpl.insertXML(SlatingDAOImpl.java:1327)
     at com.cx.hcm.ams.slatingms.impl.ejb.SlatingMgmtSessionBean.insertXML(SlatingMgmtSessionBean.java:855)
     at SlatingMgmtRemote_StatelessSessionBeanWrapper16.insertXML(SlatingMgmtRemote_StatelessSessionBeanWrapper16.java:3782)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:119)
     at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:48)
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:803)
     at java.lang.Thread.run(Thread.java:536)

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CLOB.createTemporary gives Nullpointer Exception

Hello,
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This error started when I began using Data Sources instate of direct JDBC Connections.
The problem is there is no source available for this class so I cant look what is causing the Nullpointer Exception.
Can someone tell me what is causing this problem?
Regards,
Dennis Labordus

Hi Dennis,
I have had the same problem as this. I am going to get onto Oracle via Metalink about it.
However - there is a work around.
We are using OC4J with its data sources.
There is a method on the OC4J Connection called getCoreConnection(Connection). This returns the underlying Oracle connection.
If you then pass this underlying oracle connection to CLOB.createTemporary() it works.
We had to use reflection to call the method as I couldn't seem to cast it statically.
Paul McHugh
* getOracleConnection
* Derive oracle connection from DataSource connection
private static OracleConnection getOracleConnection (Connection connection) throws SQLException
System.err.println ("UserTypeImpl.getOracleConnection: " + connection);
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System.err.println (" Connection is already the base Oracle Connection" + connection);
return (OracleConnection) connection;
* Check for an OC4J deployment
else
System.err.println (" Searching for core connection ...");
Object conObj = (Object) connection;
Class conclass = conObj.getClass();
OracleConnection coreCon = null;
Method meth = null;
// Locate method getCoreConnection on Orion data source
try {
Class[] parameterTypes = new Class[] {java.sql.Connection.class};
meth = conclass.getMethod("getCoreConnection", parameterTypes);
} catch (NoSuchMethodException e)
e.printStackTrace();
throw new SQLException ("UserTypeImpl.getOracleConnection: No such method: getCoreConnection: " + e);
// Invoke method getCoreConnection on orion data source
try {
Object[] args = new Object[] {connection};
coreCon = (OracleConnection) meth.invoke(conObj, args);
catch (InvocationTargetException e)
e.printStackTrace();
throw new SQLException ("UserTypeImpl.getOracleConnection: Invoke: getCoreConnection: " + e);
catch (IllegalAccessException e)
e.printStackTrace();
throw new SQLException ("UserTypeImpl.getOracleConnection: Invoke: getCoreConnection: " + e);
if (coreCon != null)
System.err.println (" Core connection found: " + coreCon);
return coreCon;
} else
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Bug in Oracle Driver 11.2.0.3.0 when handling CLOB?

Hello,
I got a table which is defined like this:
CREATE TABLE FOO
FOO_id NUMBER(18) NOT NULL ,
xml_content sys.XMLTYPE NOT NULL
According to the documentation Oracle is using a CLOB as internal type.
For reading the CLOB from the database we are using Spring's org.springframework.jdbc.support.lob.OracleLobHandler (Spring 3.0.6.RELEASE) class which is implemented like this:
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Clob clob = rs.getClob( columnIndex );
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releaseResourcesAfterRead( rs.getStatement().getConnection(), clob );
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For me, this looks like the valid solution. But when reading CLOB greater than 4109 bytes, the resulting String contains a 0x0 (NULL) byte. Because the table is defined to contain XML, the XML parser is unable to handle this.
As workaround I got the following solution:
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logger.debug( "Returning Oracle CLOB as string" );
Clob clob = rs.getClob( columnIndex );
initializeResourcesBeforeRead( rs.getStatement().getConnection(), clob );
readAllCharacter( clob );
String retVal = ( clob != null ? clob.getSubString( 1, (int) clob.length() ) : null );
releaseResourcesAfterRead( rs.getStatement().getConnection(), clob );
return retVal;
* Dummy read of all characters of the given lob. This fixes an issue that the resulting string
* contains 0x0 bytes.
* @param clob the clob
* @throws SQLException
private void readAllCharacter( Clob clob ) throws SQLException
if( clob != null )
Reader characterStream = clob.getCharacterStream();
char[] buffer = new char[4 * 1000];
try
while( characterStream.read( buffer ) != -1 )
catch( IOException e )
logger.error( "Exception while reading from the clob", e );
finally
try
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catch( IOException e )
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With this dummy read, the string does not contain the 0x0 token.
I think it's a Bug in the oracle.sql.CLOB class or did I miss something?
Kind regards
Michael

>
I'm unsure what you mean with your citation and how this affects my code?
>
That citation specifically tells you how the drivers (based on version) support 'the Oracle SQL XML type (XMLType)'.
>
A call to getSubString should give me the content of the clob. But why does the content contain some bytes (0x0) which should not be there.
>
A CLOB instance is just a LOB locator. A locator contains the information necessary for Oracle to 'locate' the full lob contents. It usually also contains all of the lob data that is stored 'inline' in the table row. There is a limit of around 4k for the 'inline' part of the lob data.
A lob locator does NOT contain the part of the lob that is stored in the lob segment. The 'out-of-line' lob is generally retrieved using streams as shown in that doc.
So the 'getSubString' call is only using the contents of the locator.
See Inline and Out-of_Line LOB Storage in the 'Oracle® Database SecureFiles and Large Objects Developer's Guide'
http://docs.oracle.com/cd/B28359_01/appdev.111/b28393/adlob_tables.htm
>
Inline and Out-of-Line LOB Storage
LOB columns store locators that reference the location of the actual LOB value. Depending on the column properties you specify when you create the table, and depending the size of the LOB, actual LOB values are stored either in the table row (inline) or outside of the table row (out-of-line).
LOB values are stored out-of-line when any of the following situations apply:
If you explicitly specify DISABLE STORAGE IN ROW for the LOB storage clause when you create the table.
If the size of the LOB is greater than approximately 4000 bytes (4000 minus system control information), regardless of the LOB storage properties for the column.
If you update a LOB that is stored out-of-line and the resulting LOB is less than approximately 4000 bytes, it is still stored out-of-line.
LOB values are stored inline when any of the following conditions apply:
When the size of the LOB stored in the given row is small, approximately 4000 bytes or less, and you either explicitly specify ENABLE STORAGE IN ROW or the LOB storage clause when you create the table, or when you do not specify this parameter (which is the default).
When the LOB value is NULL (regardless of the LOB storage properties for the column).
Using the default LOB storage properties (inline storage) can allow for better database performance; it avoids the overhead of creating and managing out-of-line storage for smaller LOB values. If LOB values stored in your database are frequently small in size, then using inline storage is recommended.
Note:
LOB locators are always stored in the row.
A LOB locator always exists for any LOB instance regardless of the LOB storage properties or LOB value - NULL, empty, or otherwise.
If the LOB is created with DISABLE STORAGE IN ROW properties and the BASICFILE LOB holds any data, then a minimum of one CHUNK of out-of-line storage space is used; even when the size of the LOB is less than the CHUNK size.
If a LOB column is initialized with EMPTY_CLOB() or EMPTY_BLOB(), then no LOB value exists, not even NULL. The row holds a LOB locator only. No additional LOB storage is used.
LOB storage properties do not affect BFILE columns. BFILE data is always stored in operating system files outside the database.
>
You should generally use streams to read/write LOBs as they are the most efficient way to access them. If you commonly only need a subset of the data I suggest you use a PL/SQL package/function/procedure to perform the substringing and return the results.
>
the first read results also in an String with the 0x0 byte
>
And those would be part of the lob locator.

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URGENT !! ClassCastException in CLOB.createTemporary Feb

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That is not the issue. The problem is that,
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Hi
I am facing issues when calling a report using go to URL. I have 6 cascading multiple value parameter in one of my report and from this I am calling another report by passing all these parameters using java script in go to URL option. Since I am passing
all these multiple value parameter my report URL is exceeding up to 5000 to 7000 characters long. This is not working at all as max characters in URL are allowed to be 2048.
Is there any work around to pass all these multiple value parameter using go to URL option?
I thought of using Go to report instead but our business is not allowing to this.
Thanks!
Bhushan

Hi Bhushan,
As you may know, Microsoft Internet Explorer has a maximum uniform resource locator (URL) length of 2,083 characters. Internet Explorer also has a maximum path length of 2,048 characters. This limit applies to both POST request and GET request URLs.
For more details, please see:
Maximum URL length is 2,083 characters in Internet Explorer
I am afraid it is a limitation in IE, so I would suggest you ask the questions to IE forum:
http://social.technet.microsoft.com/Forums/ie/en-US/home?category=internetexplorer threads to seek further assistance. There are many IE experts who may help workaround the limitation.
Thank you for your understanding.
Regards,
Katherine Xiong
Katherine Xiong
TechNet Community Support

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