Elusive unit test error

We are using Spring Framework 1.2 and Weblogic 8.1.4. On occasion, I will get this error when running a unit test that uses JdbcTemplate. If I re-run the test with no modifications, the test completes fine. I wish I knew why. If you have an idea, post in the comments. UPDATE: The problem seems to be that Foglight/Performasure is installed on the server and is doing something with the JDBC getConnection response. The options seems to be

1. Put the client jar for Performasure in my test classpath. I do not know if the license allows for that.
2. Remove it from the server.

I'll leave it as an exercise for the reader to decide.

java.lang.NoClassDefFoundError: com/sitraka/pas/agent/plugin/instrumentor/method/JdbcDriverInstrumentor$JdbcImplementation
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:480)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:182)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:224)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:217)
at weblogic.j2ee.ApplicationManager.loadFromNetwork(ApplicationManager.java:652)
at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:322)
at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:258)
at weblogic.j2ee.ApplicationManager.loadClass(ApplicationManager.java:253)
at weblogic.rmi.internal.ClientRuntimeDescriptor.computeInterfaces(ClientRuntimeDescriptor.java:254)
at weblogic.rmi.internal.ClientRuntimeDescriptor.intern(ClientRuntimeDescriptor.java:140)
at weblogic.rmi.internal.StubInfo.readObject(StubInfo.java:124)
at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:824)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at weblogic.common.internal.ChunkedObjectInputStream.readObject(ChunkedObjectInputStream.java:120)
at weblogic.rjvm.MsgAbbrevInputStream.readObject(MsgAbbrevInputStream.java:120)
at weblogic.rmi.internal.ObjectIO.readObject(ObjectIO.java:56)
at weblogic.rjvm.ResponseImpl.unmarshalReturn(ResponseImpl.java:164)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:293)
at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:247)
at weblogic.jdbc.common.internal.RmiDataSource_814_WLStub.getConnection(Unknown Source)
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:111)
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:77)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:462)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:528)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:561)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:579)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:589)
at com.ihc.provider.domain.ProviderImpl.findProviderForId(ProviderImpl.java:401)
at com.ihc.provider.domain.ProviderImpl.findProvider(ProviderImpl.java:383)
at com.ihc.phc.user.UserServiceImpl.addProviderInfo(UserServiceImpl.java:249)
at com.ihc.phc.user.UserServiceImpl.getMessagingDoctors(UserServiceImpl.java:231)
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:324)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:335)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148)
at com.ihc.phc.util.CacheInterceptor.invoke(CacheInterceptor.java:37)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176)
at $Proxy13.getMessagingDoctors(Unknown Source)
at com.ihc.phc.test.user.TestUserServiceImpl.testGetMessagingDoctors(TestUserServiceImpl.java:64)
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:324)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:128)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)