NPE in Dynatrace agent code

Hi,

We had failures in the application with the following stacktrace. NPE at com.dynatrace.diagnostics.agent.b.d.a seems related to the instrumentation. There were multiple instances with the exact same app deployed and having equal load distribution, but we got errors only on 2 instances which were instrumented.

This app runs on Jboss-5.1.0.GA app and uses Spring JDBC to fetch data. 

com.abc.app.getData(List,String,String) stacktrace:
java.lang.NullPointerException
at com.dynatrace.diagnostics.agent.b.d.a(Unknown Source)
at com.dynatrace.diagnostics.agent.b.a.a(Unknown Source)
at com.dynatrace.diagnostics.agent.introspection.JDBCIntrospection.MethodGenericExit(Unknown Source)
at org.jboss.resource.adapter.jdbc.WrappedConnection.prepareStatement(WrappedConnection.java:252)
at org.springframework.jdbc.core.JdbcTemplate$SimplePreparedStatementCreator.createPreparedStatement(JdbcTemplate.java:1375)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:580)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:636)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:665)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:669)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:709)

JDK info : 

java version "1.6.0_26"
Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02, mixed mode)

Dynatrace server version is "Compuware APM 5.5.0" 

 On restarting the app, the errors have not occurred -we are still monitoring. Please let us know if this could be an issue within the DT agent, or something to do with the env/app..

Thanks,

Joseph