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Monday November 14, 2005
Unsupported Class Error with slamd
Not a gotcha, more of a reference point/information piece. If you try to import a job pack with Slamd,
and the Major or Minor versions are unsupported you will get an error similar to the following.
java.lang.UnsupportedClassVersionError: com/sun/slamd/example/NewTestJobClass (Unsupported major.minor version 49.0)
java.lang.ClassLoader.defineClass0(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:502)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1634)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:860)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1307)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Class.java:140)
com.sun.slamd.server.SLAMDServer.loadJobClass(SLAMDServer.java:901)
com.sun.slamd.admin.JobPack.processJobPack(JobPack.java:408)
com.sun.slamd.admin.AdminServlet.handleInstallJobPack(AdminServlet.java:32728)
com.sun.slamd.admin.AdminServlet.doPost(AdminServlet.java:1261)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
which in this case is due to an attempt to import a job class built with a 1.5 jvm on a slamd
server using a 1.4 jvm. The workaround is simple, move your slamd server to a 1.5 jvm. The
javadoc for UnsupportedClassVersionError
sheds a little bit more light on the subject.
(2005-11-14 08:38:58.0)
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Trackback URL: http://blogs.sun.com/fintanr/entry/unsupported_class_error_with_slamd
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