hi,
I got exactly the same problem. My version is 1.1.0 snapshot on 2008-01-12,
running JBoss 4.2.2 on JDK 6. By looking at the issue in debug mode, it
looks like Sun's InstrumentationImpl tries to lookup the
InstrumentationFactory at a top level classloader, but the OpenJPA library
is available only in a bottom level one (inside JBoss UnifiedClassloader)
I just did a quick test to put the InstrumentationFactory package as a jar
to the JRE/lib/ext and I can get rid of the exception. And I also did a
debug trace and i found the exception is thrown from the following piece of
code:
org.apache.openjpa.enhance.InstrumentationFactory
vm.getClass().getMethod("loadAgent", new Class[] { String.class }).
invoke(vm, new Object[] { agentPath }); // exception!
Not sure what would be the impact but I've patched the
InstrumentationFactory so that when it creates the temporary jar, it writes
the InstrumentationFactory class as well. The modified
InstrumentationFactory is attached.
What exactly is the InstrumentationFactory about?
regards,
mingfai
Reference:
private static String getAgentJar() throws IOException {
File file = File.createTempFile(InstrumentationFactory.class.getName
(),
".jar");
file.deleteOnExit();
ZipOutputStream zout = new ZipOutputStream(new
FileOutputStream(file));
zout.putNextEntry(new ZipEntry("META-INF/MANIFEST.MF"));
PrintWriter writer = new PrintWriter(new OutputStreamWriter(zout));
writer
.println("Agent-Class: "
+ InstrumentationFactory.class.getName());
writer.println("Can-Redefine-Classes: true");
writer.println("Can-Retransform-Classes: true");
writer.flush();
zout.closeEntry();
String strFilename =
"org/apache/openjpa/enhance/InstrumentationFactory.class";
zout.putNextEntry(new ZipEntry(strFilename));
InputStream in = InstrumentationFactory.class.getResourceAsStream
("/"
+ strFilename);
copy(in, zout);
zout.close();
return file.getAbsolutePath();
}
On 1/12/08, Rahul Thakur <[EMAIL PROTECTED]> wrote:
>
> Hi,
>
> I am using OpenJPA 1.0.1 for a web application. When the web application
> starts up (Tomcat 6), the server logs show the stack trace below.
>
> The trace is not really helpful as that class is there in the JAR under
> WEB-INF/lib directory, and google'ing didn't help either; so I am not
> sure where to start investigating into this now :-(
>
> Appreciate any pointers.
>
> Thanks in advance,
> Rahul
>
> <snip>
> DEBUG ArrayConverter - No conversion required, value is already a
> java.net.URL[]
> INFO StartupServlet - DTO <--> JPA entity registration completed!
> DEBUG StoreModule - Configuring module:
> com.google.code.cisx.store.StoreModule
> java.lang.ClassNotFoundException:
> org.apache.openjpa.enhance.InstrumentationFactory
> at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> at
> sun.instrument.InstrumentationImpl.loadClassAndStartAgent(
> InstrumentationImpl.java:280)
> at
> sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(
> InstrumentationImpl.java:348)
> 12/01/2008 22:15:30 org.apache.coyote.http11.Http11Protocol start
> INFO: Starting Coyote HTTP/1.1 on http-8080
> </snip>
>
