Calling java from XSLT

Hi All,
I am trying to call java method from XSLT file. It works fine on stand alone when I use Simple Transformation java program for transformation, but the same code is throwing exception in weblogic application server.
Please help me on this issue.
Exception:
ERROR: The first argument to the non-static Java function 'getRev' is not a valid object reference.
FATAL ERROR: 'Could not compile stylesheet'
javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:828)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:617)
     at weblogic.transaction.internal.ServerTransactionImpl.globalRetryCommit(ServerTransactionImpl.java:2737)
at weblogic.transaction.internal.ServerTransactionImpl.globalCommit(ServerTransactionImpl.java:2657)
at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:285)
at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:233)
at weblogic.ejb.container.internal.BaseRemoteObject.postInvoke1(BaseRemoteObject.java:621)
at weblogic.ejb.container.internal.StatelessRemoteObject.postInvoke1(StatelessRemoteObject.java:60)
at weblogic.ejb.container.internal.BaseRemoteObject.postInvokeTxRetry(BaseRemoteObject.java:441)
at com.agile.pc.cmserver.change.ChangeSessionBean_3rbfzs_EOImpl.processWorkflowExtensions(ChangeSessionBean_3rbfzs_EOImpl.java:10838)
at com.agile.pc.cmserver.base.CMRouteSessionBean.changeStatus(CMRouteSessionBean.java:960)
at com.agile.pc.cmserver.base.CMRouteSessionBean.changeStatus(CMRouteSessionBean.java:898)
at com.agile.pc.cmserver.base.CMRouteSessionBean.changeStatus(CMRouteSessionBean.java:888)
at com.agile.pc.cmserver.change.ChangeSessionBean_3rbfzs_EOImpl.changeStatus(ChangeSessionBean_3rbfzs_EOImpl.java:12050)
at com.agile.ipa.pc.CMRoute.changeStatus(CMRoute.java:705)
at com.agile.ui.pcm.common.RouteHandler.changeStatus(RouteHandler.java:1747)
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:597)
at com.agile.ui.web.action.ActionServlet.invokeMethod(ActionServlet.java:1067)
at com.agile.ui.web.action.ActionServlet.handleRequest(ActionServlet.java:672)
at com.agile.ui.web.action.ActionServlet.doPost(ActionServlet.java:309)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.agile.ui.pcm.common.filter.RemoteFSRequestFilter.doFilter(RemoteFSRequestFilter.java:148)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.agile.ui.web.filter.LoggingFilter.doFilter(LoggingFilter.java:108)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.agile.ui.pcm.common.filter.WebClientLog.doFilter(WebClientLog.java:78)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.jspbook.GZIPFilter.doFilter(GZIPFilter.java:21)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at com.agile.ui.pcm.common.filter.SSOTicketFilter.doFilter(SSOTicketFilter.java:89)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3592)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2202)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2108)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1432)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
XSLT sample code:
<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
     xmlns:pl="com.oracle.test.Sample" version="2.0">
     <xsl:template match="/">
          <xsl:variable name="rev" select="'02'" />
          <xsl:variable name="msg" select="pl:getRev($rev)" />
          <xsl:element name="result">
               <xsl:value-of select="$msg" />
          </xsl:element>
     </xsl:template>
</xsl:stylesheet>
Sample.java :
package com.oracle.test;
import java.io.*;
public class Sample {
     public static String getRev(String rev) {
          // some logic i am going include here
          if (rev.equals("01")) {
               return "valid one";
          return "";
Thanks All,

ERROR: The first argument to the non-static Java function 'getRev' is not a valid object reference.Because it results in this error rather than anything else, you have to verify (apart from typos) the actual files finally deployed to run that your method getRev is declared "static", and that the argument $rev is setup with select="'02'" and not select="02". (What you posted looks fine, just make sure it remains the same in those essential aspect.)

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___[MOD] C:\Documents and Settings\Elie A. Cohen.USINC022\My Documents\Visual Studio 2010\Projects\Repo API Example\Repo API Example\obj\x86\Release\Interop.axb.dll
| M A N I F E S T
|___[NSP] axb
| |___[INT] axb.axb
| | | .class interface public abstract auto ansi import /*02000006*/
| | | implements axb.axbDispatch/*02000003*/
| | | implements axb.axbSource_Event/*02000005*/
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| |
| |___[CLS] axb.axbClass
| | | .class public auto ansi import /*02000004*/
| | | implements axb.axbDispatch/*02000003*/
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InnerException:

In case you haven't figured it out already... Or if anyone else is curious... Or for myself when I get old and forgetful...
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God bless,
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Function ScriptToCall(object) {
variable mychoiceisdifferent;
mychoiceisdifferent= object.myProperty / 2;
return mychoiceisdifferent;
According to what ScriptToCall looks like the result on page would be different
Thanks in advance for your advises
Olivier.

1) The script will be running in the browser, not the server, yes? So in Netscape you can load Java objects via Javascript, but IE doesn't seem to support this. Although in either, you can call methods on an applet in the page. But you can't call a JS function from the Java code in the JSP page, since that is only executed on the server.
2) Only if the "result" is submitted back to the server.

Calling java from csh scripts

I have recently come across certain projects where Java has being used as an alternative for scripting purposes. What I am trying to say here is that making calls to java programs from csh scripts and these Java programs are merely doing trivial/sql tasks which could have very well been carried out in a scripting language itself. and then Java calling some scripts so ending up with a chain of Java calling scripts which call Java and so on.
It has been my understanding all along that such a design would not be something recommended, and there should be a separation of concerns and a clear demarcation between Java and the scripting code. What however I am struggling with is finding some articles or papers supporting this thought and I would greatly appreciate if some you have something you would like to share preferably an article, supporting or negating such a design.
Edited by: kilyas on Mar 25, 2010 2:52 PM

>
Actually my original post was a reply to Saish. But thanks for the input. It's good to know that you extend TDD to scripting as well, but most of the scenarios I have come across thats not been the case. Whether thats the lack of test tools/libraries like JUnit or JMock for csh scripting or the user's frame of mind of getting things done, I am not sure.There's no need for such tools. Even in Java et al, test harnesses can be hand-whittled. JUnit is just Java code, after all. Test harnesses for scripts are no different. As an extremely basic example, you might a file that picks up everything from one directory, run a sed application against it, and dump the results in another directory. Writing tests for that is pretty easy; start with a couple of sample input files, and expected outs, apply your script, do a diff on the resut against the expected outs. Granted there isn't a nice UI to give you a green bar with shell scripts, but you can still get a list of pass/fail stats. Groovy scripts, of course, can be run in an actual JUnit runner.
If you're finding it too hard to test scripts, like perhaps there are too many different flows of execution through the script, it's worth considering whether the task-at-hand is really a scripting job at all. The sweet spot for scripts is gluing together the stuff that performs all the complex logic.
What are the best practices recommendations for such a scenario, I am sure there much be something about it or some pattern or anti pattern dealing with it and some review of such an implementation. Don't you think so?I hope so! I've been tasked with documenting a scripting standard written by another developer, finding references to cite and such-like. There do exist coding standards on the web for scripting, shouldn't be too hard to find something useful. As for reviews, I expect simple peer review by someone else who knows scripting is about as good as it's going to get.
I'd add that logging plays an important part in scripting, just as it does in your "real" code

ClassDefNotFound error when calling Java from C++

Hi all,
I have a problem with calling my java from C++ through JNI.
I have set my CLASSPATH environment varible that include path to every libary that I need. My source is as follows:
#include <jni.h>
#include <stdio.h>
int main()
     JNIEnv               *env;
     JavaVM               *jvm;
     JavaVMInitArgs     vm_args;
     jint               res;
     jclass               cls;
     jmethodID          mid;
IMPORTANT: specify vm_args version # if you use JDK 1.1.2 and beyond
     vm_args.version = JNI_VERSION_1_4;
     vm_args.ignoreUnrecognized = JNI_TRUE;
     JNI_GetDefaultJavaVMInitArgs(&vm_args);
     /* Create the Java VM */
     res = JNI_CreateJavaVM(&jvm, (void**)&env, &vm_args);
     if (res < 0) {
          printf("Can't create JVM\n");
          return 1;
     cls = (env)->FindClass ("dds/test/comm/listeners/NACKListenerFrame");
     if (cls == 0)     {
          printf("Can't find NACKListenerFrame Class\n");
          return 1;
mid = (env)->GetStaticMethodID(cls, "start", "()V");
     if (mid == 0)     {
          printf("Can't find NackListnerFrame.start \n");
          return 1;
     (env)->CallStaticVoidMethod((_jclass*)cls, (_jmethodID*)mid, NULL);
     jthrowable e = (env)->ExceptionOccurred();
     if (e)     {
          env->ExceptionDescribe();
          env->ExceptionClear();
     if ((jvm)->DestroyJavaVM() < 0)     {
          printf("Cannot destroy JVM./n");
     return 0;
I deliberately left out the codebelow because I want the JVM I created to load Classes from the system's CLASSPATH variable as I have set path to every classes that I need, in that CLASSPATH variable.
JavaVMOption     options[1];
options[0].optionString=
"-Djava.class.path=.;E:/DDSproject/DDSImplementation/classes";
vm_args.options = options;
vm_args.nOptions = 1;
But it seems like unless I specify CLASSPATH in my C++ source code the JVM could not find any classes.
I tried to put the "jvm.dll" path to the first one in the System's PATH variable. It does not work either...
Gurus Pls help!!!.. I don't know what to do... I don't wanna code my CLASSPATH in my c++ source code as above.
Thanks in advance,
chancellor

I was thinking JVM should the classpath when it is invoked. But obviously it is not and we need to assign the classpath ourselves when invoking from native side. Thanks for pointing that out. For other people's benefit the following is the code piece I for initializing JVM.
char* str1;
          char* str2;
          char* classpath;
          str1 = "-Djava.class.path=";
          str2 = std::getenv("CLASSPATH");
          classpath = (char*)malloc(strlen(str1) + strlen(str2) + 1);
          strcpy(classpath, str1);
          strcat(classpath, str2);
          if (str2 == NULL)     {
               printf("CLASSPATH environment variable is not defined.");
               exit(1);
          m_VmArgs.version = JNI_VERSION_1_4;
          m_options[0].optionString= classpath;
          m_VmArgs.options = m_options;
          m_VmArgs.nOptions = 1;
          m_VmArgs.ignoreUnrecognized = JNI_TRUE;
          JNI_GetDefaultJavaVMInitArgs(&m_VmArgs);
          /* Create the Java VM */
          m_Res = JNI_CreateJavaVM(&m_Jvm, (void**)&m_Env, &m_VmArgs);
          if (m_Res < 0) {
               printf("Can't create JVM\n");
               exit(1);
thanks,
chancellor

Calling Java from BPEL

Hi,
Is WSIF still the best/recommend way to call java code from your BPEL? Or are we moving away from that kind of env. and should put a wrapper around the legacy java code and expose them as services?
Regards,
Muasir

hi,
Java can't call BPEL directly. So you have following steps:
1. Create Web Service from existing java file(Some tools can generate Web Service from java class).
2. Generate the Service Proxy by using Web Service.
3. Invoke the Web Service through proxy.
4. If your application use the struts, you can invoke the process from struts action class, which is called from a web page.
Maybe it is useful for you!

Advantages of calling java from PL/SQL

Hi experts,
Could any one tell me the advantages of calling java program from PL/SQL?
Regards,
karthi

Hi,
You can read the free first chapter of my book @ http://www.amazon.com/gp/product/1555583296/ (see details then Excerpt)
Kuassi http://db360.blogspot.com

Calling Java from C++ using JNI

I have been looking into JNI, and I ran sample where the Java calls Native c/c++ methods. Now to do it the other way, having C/C++ to call Java method by passing argument and getting the results back, I think I need to follow the example in Chapter 5 sun, which is creating JVM in the native code, accessing the Java class and method, and then finally calling the Java method.
First I like to know if I'm right above, and second if I need to pass a C++ class as the argument to the Java method and then the result from the method is Java class, what would be the best way to do? I know I need some to convert the class type some how.
Thanks,
Eli

Are you also wanting to launch Java from C++? Unzip JAVA_HOME/src.zip and look at the source code for java.exe
If you have native called by a Java object then you can call any non native method in the Java object from the C/C++ side. Example Java method, reportCurrentStagePosition :
    public void reportCurrentStagePosition (int fault, double x, double y, double z, double φ)
        if (fault == 0)
            reportCurrentStagePosition (x, y, z, φ);
        else
            faultMessage = "Stage Positioning Fault: X="+eFormat(x)+", Y="+eFormat(y)+", Z="+eFormat(z)+", phi="+eFormat(φ);
            System.out.println ("***Aero Fault Message: "+faultMessage);
    public native long moveLinearXYZPhiAxes() throws PositionException;Then from the native side of moveLinearXYZPhiAxes the obj is the calling object and has the reportCurrentStagePosition method
JNIEXPORT jlong JNICALL Java_com_hypernex_goniometer_AerotechWrapperN_moveLinearXYZPhiAxes (JNIEnv *env, jobject obj)
     jmethodID jReportPositions = env->GetMethodID(env->GetObjectClass(obj), "reportCurrentStagePosition", "(IDDDD)V");
     if (jReportPositions == NULL)
          printf ("***ERROR*** about to call jReportPositions but it is NULL ***\n");
     else
         env->CallVoidMethod (obj, jReportPositions, 0, xFeedBack, yFeedBack, zFeedBack, phiFeedBack);
}Since reportCurrentStagePosition returns a void you use the CallVoidMethod of env. The "(IDDDD)V" is the signature of the method. If it is there GetMethodID returns a non null.

Calling java from XSLT

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