I'm profiling (using instrumentation) a Java web app on Tomcat. When I attach a JProfiler session it first goes through a period of Retransforming Classes. During this period I am seeing numerous messages in the Tomcat log like these:
JProfiler> ERROR: could not retransform class Lcom/zaxxer/hikari/pool/HikariPool$HouseKeeper$$Lambda$36/1482601803; (62).
JProfiler> ERROR: could not retransform class Lcom/zaxxer/hikari/pool/HikariPool$HouseKeeper$$Lambda$35/545889432; (62).
JProfiler> ERROR: could not retransform class Lcom/sun/jersey/atom/rome/impl/provider/entity/AtomEntryProvider; (113).
JProfiler> ERROR: could not retransform class Lcom/sun/jersey/atom/rome/impl/provider/entity/AtomFeedProvider; (113).
What is the cause and implication of these errors?
I'm using:
Tomcat 7.0.55
Java 8
JProfiler 8.0.7
The used version of JProfiler is too old and does not fully support Java 8. Updating to 8.1.4 will fix this issue.