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Re: [ecf-dev] Distributed OSGi with ECF
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Hi Eugen,
Eugen Reiswich wrote:
Hi folks,
I'm just trying to get familiar with Distributed OSGi with ECF. I
followed the instructions
here: http://bryanhunt.wordpress.com/2009/06/20/remote-declarative-osgi-services/
But when I try to launch my example I get the following error:
java.lang.LinkageError: loader constraint violation: loader (instance
of org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader)
previously initiated loading for a different type with name
"de/c1wps/winterschool/domain/kunde/material/Kunde"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:700)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:183)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:576)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:546)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:477)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass_LockClassLoader(ClasspathManager.java:465)
at
org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:445)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:211)
at
org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:381)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:457)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
at
org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:398)
at
org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:105)
at java.lang.ClassLoader.loadClass(ClassLoader.java:254)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:399)
at
proxy.fbipcahacoinformatikouni_hamburgode_jcicfc.de.c1wps.winterschool.domain.kunde.service.IKundenServiceImpl.erzeugeKunde(Unknown
Source)
at
de.c1wps.winterschool.kundekontoverwalter.KundenVerwalter._erstelleKunde(KundenVerwalter.java:26)
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
org.eclipse.osgi.framework.internal.core.FrameworkCommandInterpreter.execute(FrameworkCommandInterpreter.java:155)
at
org.eclipse.osgi.framework.internal.core.FrameworkConsole.docommand(FrameworkConsole.java:303)
at
org.eclipse.osgi.framework.internal.core.FrameworkConsole.console(FrameworkConsole.java:288)
at
org.eclipse.osgi.framework.internal.core.FrameworkConsole.run(FrameworkConsole.java:224)
at java.lang.Thread.run(Thread.java:637)
I've already double checked that it's not the same error described
here: http://dev.eclipse.org/newslists/news.eclipse.technology.ecf/msg01329.html
Everything seem to work fine when I use primitive data types as
service interface parameters. By when I change the parameter types to
more complex one the above exception is thrown.
A question: which distribution provider are you using? (i.e. r-osgi,
ecf generic, jms...something else)? Also...what version of ECF are you
currently using?
And are the service types in exported packages? In general, the types
of the service interface parameters have to be in exported packages so
that the distribution provider can dynamically load the class during
parameter marshalling/unmarshalling. And finally...are your service
types declared as implementing Serializable?
The classloading error you are getting:
java.lang.LinkageError: loader constraint violation: loader (instance of
org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader) previously
initiated loading for a different type with name
"de/c1wps/winterschool/domain/kunde/material/Kunde"
makes me suspect that the service parameter types *are* exported, but
that somehow you have more than one copy of the given class
(de/c1wps/winterschool/domain/kunde/material/Kunde) in your runtime...so
when the distribution provider goes to load a class with
DynamicImport-Package, it finds the wrong version/copy of
de/c1wps/winterschool/domain/kunde/material/Kunde...since perhaps there
are two (or more) available to the classloader (resulting in this
LinkageError). If this is true (that there is more than one
copy/version of this service class in your runtime...perhaps in more
than one bundle), then this duplication should be eliminated.
This may be some other issue/bug with the provider, however...e.g.
something associated with the service parameter type not being
Serializable...so please do let know which one is being used and whether
the service types are Serializable.
Scott