When does Java load classes?

Hi there,
I have a question about when Java is loading class? Does it load the class when use it or it will load all classes in the scope in one shot?
Let's say I have a projectA java program which has classA:
class classA{
I have a jar file: my.jar which uses classA if it is used in projectA:
class myClass{
if( enviroment.equals("projectA") )
classA a = new classA();
This works no problem.
Now let's say I have another program call projectB, which does NOT has classA; Now, can I link my.jar to this projectB and run??
Thanks

Java loads classes only upon access.

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Thanks for all your replies.
Cheers.
Edited by: arijit_datta on May 15, 2008 4:07 PM

Solved.
Here is the solution:
[http://www.nabble.com/Applet-does-not-load-on-app-server-when-Free-Design-Layout-to17259115.html|http://www.nabble.com/Applet-does-not-load-on-app-server-when-Free-Design-Layout-to17259115.html]
Cheers..
Edited by: arijit_datta on May 16, 2008 7:41 AM

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>>> at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265)
>>> at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
>>> at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
>>> at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
>>> at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.emSDK.license.LicenseFilter.doFilter(LicenseFilter.java:166)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.adf.model.servlet.ADFBindingFilter.doFilter(ADFBindingFilter.java:205)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:106)
>>> at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:447)
>>> at oracle.adfinternal.view.faces.activedata.AdsFilter.doFilter(AdsFilter.java:60)
>>> at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl$FilterListChain.doFilter(TrinidadFilterImpl.java:447)
>>> at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl._doFilterImpl(TrinidadFilterImpl.java:271)
>>> at org.apache.myfaces.trinidadinternal.webapp.TrinidadFilterImpl.doFilter(TrinidadFilterImpl.java:177)
>>> at org.apache.myfaces.trinidad.webapp.TrinidadFilter.doFilter(TrinidadFilter.java:92)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.help.web.rich.OHWFilter.doFilter(Unknown Source)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.emas.fwk.MASConnectionFilter.doFilter(MASConnectionFilter.java:41)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.adf.library.webapp.LibraryFilter.doFilter(LibraryFilter.java:180)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.eml.app.AuditServletFilter.doFilter(AuditServletFilter.java:183)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.eml.app.EMRepLoginFilter.doFilter(EMRepLoginFilter.java:203)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.core.model.targetauth.EMLangPrefFilter.doFilter(EMLangPrefFilter.java:158)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.core.app.perf.PerfFilter.doFilter(PerfFilter.java:141)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.sysman.eml.app.ContextInitFilter.doFilter(ContextInitFilter.java:542)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.security.jps.ee.http.JpsAbsFilter$1.run(JpsAbsFilter.java:119)
>>> at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:315)
>>> at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:442)
>>> at oracle.security.jps.ee.http.JpsAbsFilter.runJaasMode(JpsAbsFilter.java:103)
>>> at oracle.security.jps.ee.http.JpsAbsFilter.doFilter(JpsAbsFilter.java:171)
>>> at oracle.security.jps.ee.http.JpsFilter.doFilter(JpsFilter.java:71)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at oracle.dms.servlet.DMSServletFilter.doFilter(DMSServletFilter.java:139)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
>>> at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
>>> ... 9 more

Hi Manish,
It seems that you are using a custom security provider and the weblogic server is not able to find the class / jar file that contains the class.
java.lang.ClassNotFoundException: Failed to load class com.msl.security.providers.SessionPrincipal]
Make sure you have all the required jar files in the server classpath.
You can use the JarScan utility to find the jar that contains the class.
Refer the below link regarding the jarScan.
http://weblogic-wonders.com/weblogic/2011/01/26/finding-jar-files-using-jarscan/
Regards,
Anandraj
http://weblogic-wonders.com

Windows Vista "java.lang.ClassNotFoundException: loader.class" error.

Hello,
Whenever I try to visit websites that have a java applet I get a dialogue with the following error:
java.lang.ClassNotFoundException: loader.class.
I have tried uninstalling/reinstalling java, and also adding the -xmx and -xms parameters for java applet runtime setting in control panel with various values from 128m to 1g.
The applet at http://www.java.com/en/download/installed.jsp?detect=jre&try=1 does work and reports "CONGRATULATIONS, you have the Latest version of Java!", "Java Runtime Version 1.6.0."
I have been experiencing this problem ever since I installed Windows Vista Home Premium a day or two ago. Any help is appreciated.
Regards
Greg
=====================================
Full output from Java Console
=====================================
Java Plug-in 1.6.0
Using JRE version 1.6.0 Java HotSpot(TM) Client VM
User home directory = C:\Users\Greg Taylor
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
load: class loader.class not found.
java.lang.ClassNotFoundException: loader.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more
java.lang.ClassNotFoundException: loader.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more

ive been having the same problems, if youve resolved this problem, please tell me.
all help is appreciated

Applet does not load in IE when hosted in form via SHDocVw.dll

Hi
I have a signed applet that usually works well in IE and Mozilla FireFox.
It shows a popup window with the security question Yes/No/Always and works great thereafter.
However
We have now developed a Vb.Net application which hosts the SHDocVw.dll and now when for example I navigate to the web page within this embedded browser control from Microsoft the applet does not load and the popup window does not appear, when trying to access it via clientside scriptring it does not find the applet object.
// this fails when called from embedded browser control
<script>
document.applets[0].prepareControl();
</script>
Please help me I would really like to get the applet to work when using this new vb.net application with the embedded browser control because it is becoming our company's standard to hos apps in this new app and not open a new instance of IE for each application.
Thanks
Ian Coetzer

What does the trace say?
To turn the full trace on (windows) you can start the java console, to be found here:
C:\Program Files\Java\j2re1.4...\bin\jpicpl32.exe
In the advanced tab you can fill in something for runtime parameters fill in this:
-Djavaplugin.trace=true -Djavaplugin.trace.option=basic|net|security|ext|liveconnect
if you cannot start the java console check here:
C:\Documents and Settings\userName\Application Data\Sun\Java\Deployment\deployment.properties
I think for linux this is somewhere in youruserdir/java (hidden directory)
add or change the following line:
javaplugin.jre.params=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
for 1.5:
deployment.javapi.jre.1.5.0.args=-Djavaplugin.trace\=true -Djavaplugin.trace.option\=basic|net|security|ext|liveconnect
The trace is here:
C:\Documents and Settings\your user\Application Data\Sun\Java\Deployment\log\plugin...log
I think for linux this is somewhere in youruserdir/java (hidden directory)
Print out the full trace of the exception:
try{...}catch(Exception e){e.printStackTrace();}
If no trace is created my guess is that the jre is never started, try the <object tag
instead for your applet (html page) because your browser tries to run the applet with msjvm.

Java.lang.Class- getFields() results in JVM crash when called through JNI

From a C++ application, I use Invocation APIs to create a JVM and call some Java methods using JNI
I get a crash in jvm.dll with EXCEPTION_ACCESS_VIOLATION
when I try to call "getFields" method of java.lang.Class in order to get the Fields of the java class
This method call, should return a java/lang/reflect/Fields[] on success
I am able to get the method ID of this method by using pEnv->GetMethodID(..)
However, when I call this method using CallObjectMethod(..), HotSpt JVM crashes with access violation with the dump given below.
Any clues on how to debug and find the problem?
Or has anyone tried getting the fields of a Java class from C++ by calling reflection APIs uing JNI?
Thanks in advance!
Sample code
jclass testerClass = pEnv->FindClass("com/test/Tester");
jmethodID cid = pEnv->GetMethodID(testerClass,"<init>","()V");
if(NULL == cid)
pEnv->ExceptionDescribe();
jobject testerObject = pEnv->NewObjectV(testerClass, mid);
jmethodID mid = pEnv->GetMethodID(testerClass, "getClass",
                         "()Ljava/lang/Class;");
jobject clsObj = (jobject)pEnv->CallObjectMethod(testerObject, mid);
pEnv->ExceptionDescribe();
jclass      jCls = pEnv->GetObjectClass(clsObj);
jmethodID midGetFields = pEnv->GetMethodID(jCls, "getFields",
                                        "()[Ljava/lang/reflect/Field;");
jobjectArray jobjArray = (jobjectArray)pEnv->CallObjectMethod(testerObject, midGetFields);
pEnv->ExceptionDescribe();
Crash dump
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x809E69F
Function=JVM_FindSignal+0x11505
Library=D:\Java\j2re1.4.2_03\bin\client\jvm.dll
Current Java thread:
     at java.lang.Class.privateGetDeclaredFields(Unknown Source)
     at java.lang.Class.privateGetPublicFields(Unknown Source)
     at java.lang.Class.getFields(Unknown Source)
Dynamic libraries:
0x00400000 - 0x00419000      E:\SC\SC12.1\SCApplications\SNMP\Bin\JNITester.exe
0x77F50000 - 0x77FF7000      C:\WINDOWS\System32\ntdll.dll
0x77E60000 - 0x77F46000      C:\WINDOWS\system32\kernel32.dll
0x10000000 - 0x10023000      E:\SC\SC12.1\SCApplications\SNMP\Bin\JniUtils.dll
0x00320000 - 0x00332000      E:\SnmpIpmNativeTestDriver\MTFStubHelper.dll
0x00340000 - 0x0035B000      E:\SnmpIpmNativeTestDriver\MTFXMLFileAPI.dll
0x12000000 - 0x122B1000      e:\sc\sc12.1\bin\xerces-c_2_2_0D.dll
0x77DD0000 - 0x77E5D000      C:\WINDOWS\system32\ADVAPI32.dll
0x78000000 - 0x78086000      C:\WINDOWS\system32\RPCRT4.dll
0x10200000 - 0x1026C000      e:\sc\sc12.1\bin\MSVCRTD.dll
0x102A0000 - 0x102B7000      e:\sc\sc12.1\bin\MSVCIRTD.dll
0x5F800000 - 0x5F8E9000      e:\sc\sc12.1\bin\MFC42uD.DLL
0x77C70000 - 0x77CB0000      C:\WINDOWS\system32\GDI32.dll
0x77D40000 - 0x77DCC000      C:\WINDOWS\system32\USER32.dll
0x5F700000 - 0x5F746000      e:\sc\sc12.1\bin\MFCD42uD.DLL
0x5F500000 - 0x5F5C6000      e:\sc\sc12.1\bin\MFCO42uD.DLL
0x10480000 - 0x104FE000      e:\sc\sc12.1\bin\MSVCP60D.dll
0x15020000 - 0x15042000      e:\sc\sc12.1\bin\SCTraceLib.dll
0x6D510000 - 0x6D58D000      C:\WINDOWS\System32\dbghelp.dll
0x77C10000 - 0x77C63000      C:\WINDOWS\system32\msvcrt.dll
0x77C00000 - 0x77C07000      C:\WINDOWS\system32\VERSION.dll
0x00360000 - 0x0037D000      e:\sc\sc12.1\bin\SCFileManager.dll
0x76BF0000 - 0x76BFB000      C:\WINDOWS\System32\PSAPI.DLL
0x00420000 - 0x00580000      e:\sc\sc12.1\bin\BctCoreCL.dll
0x5D920000 - 0x5D929000      C:\WINDOWS\System32\RPCNS4.dll
0x71B20000 - 0x71B31000      C:\WINDOWS\system32\MPR.dll
0x71C20000 - 0x71C6E000      C:\WINDOWS\System32\NETAPI32.dll
0x71AB0000 - 0x71AC5000      C:\WINDOWS\System32\WS2_32.dll
0x71AA0000 - 0x71AA8000      C:\WINDOWS\System32\WS2HELP.dll
0x15000000 - 0x15012000      e:\sc\sc12.1\bin\CTEventLog.dll
0x773D0000 - 0x77BC2000      C:\WINDOWS\system32\SHELL32.dll
0x70A70000 - 0x70AD4000      C:\WINDOWS\system32\SHLWAPI.dll
0x771B0000 - 0x772D1000      C:\WINDOWS\system32\ole32.dll
0x77120000 - 0x771AB000      C:\WINDOWS\system32\OLEAUT32.dll
0x1F7A0000 - 0x1F7D6000      C:\WINDOWS\System32\ODBC32.dll
0x77340000 - 0x773CB000      C:\WINDOWS\system32\COMCTL32.dll
0x763B0000 - 0x763F5000      C:\WINDOWS\system32\comdlg32.dll
0x08000000 - 0x08138000      D:\Java\j2re1.4.2_03\bin\client\jvm.dll
0x76B40000 - 0x76B6C000      C:\WINDOWS\System32\WINMM.dll
0x5FD00000 - 0x5FD0D000      C:\WINDOWS\System32\MFC42LOC.DLL
0x71950000 - 0x71A34000      C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.10.0_x-ww_f7fb5805\comctl32.dll
0x1F840000 - 0x1F857000      C:\WINDOWS\System32\odbcint.dll
0x5DAC0000 - 0x5DAC7000      C:\WINDOWS\System32\rdpsnd.dll
0x00FE0000 - 0x00FE7000      D:\Java\j2re1.4.2_03\bin\hpi.dll
0x01000000 - 0x0100E000      D:\Java\j2re1.4.2_03\bin\verify.dll
0x01010000 - 0x01029000      D:\Java\j2re1.4.2_03\bin\java.dll
0x01030000 - 0x0103D000      D:\Java\j2re1.4.2_03\bin\zip.dll
0x76C90000 - 0x76CB2000      C:\WINDOWS\system32\imagehlp.dll
Heap at VM Abort:
Heap
def new generation total 576K, used 132K [0x15050000, 0x150f0000, 0x15530000)
eden space 512K, 25% used [0x15050000, 0x15071250, 0x150d0000)
from space 64K, 0% used [0x150d0000, 0x150d0000, 0x150e0000)
to space 64K, 0% used [0x150e0000, 0x150e0000, 0x150f0000)
tenured generation total 1408K, used 0K [0x15530000, 0x15690000, 0x19050000)
the space 1408K, 0% used [0x15530000, 0x15530000, 0x15530200, 0x15690000)
compacting perm gen total 4096K, used 964K [0x19050000, 0x19450000, 0x1d050000)
the space 4096K, 23% used [0x19050000, 0x191410e0, 0x19141200, 0x19450000)
Local Time = Wed Aug 25 21:06:44 2004
Elapsed Time = 0
# HotSpot Virtual Machine Error : EXCEPTION_ACCESS_VIOLATION
# Error ID : 4F530E43505002EF
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
# Java VM: Java HotSpot(TM) Client VM (1.4.2_03-b02 mixed mode)

You are right, I tried getting the java.lang.Class reference for the com.test.Tester by calling getClass() on com.test.Tester
And using this jclass reference for java.lang.Class, I tried getting the method ID of getFields and eventually the Field[]
Thanks for the help
I have some more questions.
Assumption - Using JNI, I got the fields array of com.test.Tester and I am iterating through the fields
1.Assuming that the Tester class had an Integer field say m_nIntVal, then once I get the jobject equivalent of this Field in C++.
Now I need to get the type of the field (I call the method java.lang.reflect.getType() from JNI)
This gives me a jclass reference to it's type i.e java.lang.Integer
2.I need to get the name of this type i.e I want to get the name of the type in a string as "java.lang.Integer"
For this, on the jclass reference of java.lang.Integer got in Step 1, I call getClass() from JNI (to get the java.lang.Class) and then getName()
Now, for calling getClass(), I need a temporary object reference corresponding to the jclass of java.lang.Integer, The problem is that Integer does not have a default constructor, so my call to create the jobject fails.
But, since I do not know that I am constructing an Integer (remember that is what I am trying to find out - getType), I cant pass any values to constructor
Now, how do I go about creating a jobject of Integer, without knowing that I am constructing that, as this does not have a default constructor without parameters
Also, I tried using AllocObject to get the jobject and then tried to get the method ID of getClass(). Even this failed
3. If the com.test.Tester class had a primitive "int" field, say m_nPrimitiveInt
for which java provides a Class representation, I am able to get the jclass reference to the type of m_nPrimitiveInt
Now, how do I get the name of the type as "int" in a string?
Forllowing a similar procedure like in Step 2 fails when I try to pass the jclass reference to the type of m_nPrimitiveInt to the GetMethodID
with the error FATAL ERROR in native method: JNI received a class argument that is not a class
Can you tell me what is the way out?
Thanks in advance,
Also, can I mail you with some doubts that I have? If its ok, please contact me at [email protected]

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