Andy McCright created GERONIMO-6482:
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Summary: Ensure loading of JVM ext classloader classes from
Geronimo bundles
Key: GERONIMO-6482
URL: https://issues.apache.org/jira/browse/GERONIMO-6482
Project: Geronimo
Issue Type: Bug
Security Level: public (Regular issues)
Components: osgi
Affects Versions: 3.0.1
Reporter: Andy McCright
Assignee: Andy McCright
Priority: Minor
IBM has changed the classloader used to load com.sun.* (specifically
com.sun.script.javascript) classes in JDK 7. In JDK 6, these classes were
loaded by the JVM's boot classloader - in JDK 7, they are loaded via the JVM's
ext classloader (a child classloader of the boot loader). This change has the
effect of breaking servlet code like this:
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
if(engine == null) {
throw new RuntimeException("Oh no, unable to find a script engine
found for JavaScript");
}
When running Geronimo 3.0.1 on JDK 6, this code works (engine is non-null, no
exception is thrown). When I switch to JDK7, I see:
ScriptEngineManager providers.next(): javax.script.ScriptEngineFactory:
Provider com.sun.script.javascript.RhinoScriptEngineFactory not found
java.lang.RuntimeException: Oh no, unable to find a script engine found for
JavaScript
at org.apache.jsp.HelloWorld_jsp._jspService(HelloWorld_jsp.java:96)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at
org.apache.geronimo.tomcat.GeronimoStandardContext$SystemMethodValve.invoke(GeronimoStandardContext.java:731)
at
org.apache.geronimo.tomcat.valve.GeronimoBeforeAfterValve.invoke(GeronimoBeforeAfterValve.java:48)
at
org.apache.geronimo.tomcat.valve.ProtectedTargetValve.invoke(ProtectedTargetValve.java:53)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:947)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1009)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at org.apache.geronimo.pool.ThreadPool$1.run(ThreadPool.java:267)
at
org.apache.geronimo.pool.ThreadPool$ContextClassLoaderRunnable.run(ThreadPool.java:397)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1121)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614)
at java.lang.Thread.run(Thread.java:769)
The reason this fails is that the bundle's classloader's parent loader is the
JVM's boot classloader, not the ext loader - so it cannot load the com.sun.*
classes that it needs (and that it could in JDK6).
One solution to this is to add the following line to
<geronimo_home>/etc/system.properties:
osgi.parentClassloader=ext
This forces the bundle's to search the ext loader (in addition to the boot
loader) on boot delegated loads.
Jarek suggested using the following system property, which similarly resovles
the problem (by forcing all bundles to use the framework classloader as its
parent) and is a property used in Karaf:
org.osgi.framework.bundle.parent=framework
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