Class found in negative Cache

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Hi!

We're experiencing the problem that an EP based on WAS-Java (7.00 SP12 - single instance with 2 servernodes) is hanging every few hours. We have a call open with SAP, but so far no useable results have come out of that.

One of the error messages that frequently occurs in the default trace of the servernodes is the following:

javax.naming.NoInitialContextException: Cannot instantiate class: com.inqmy.services.jndi.InitialContextFactoryImpl [Root exception is java.lang.ClassNotFoundException: com.inqmy.services.jndi.InitialContextFactoryImpl

Found in negative cache

Could someone of you maybe explain to me what it means? Especially the part about the 'negative Cache' is obscure to me. Has anyone ever seen something like that and what did you do to fix it (if it needs to be fixed at all)?

Thanks for your answers in advance,

Jörg