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I'am trying start my webapp on my tomcat manager, but it dowsn't up. I'm reading log file of the webapp and I have thise error:

8-giu-2017 9.41.12 org.apache.catalina.core.StandardContext start GRAVE: Error listenerStart 8-giu-2017 9.41.12 org.apache.catalina.core.StandardContext start GRAVE: Context [/ImageProcessor] startup failed due to previous errors 8-giu-2017 9.41.12 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc GRAVE: The web application [/ImageProcessor] registered the JDBC driver [oracle.jdbc.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 8-giu-2017 9.41.12 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads GRAVE: The web application [/ImageProcessor] appears to have started a thread named [oracle.jdbc.driver.BlockSource.ThreadedCachingBlockSource.BlockReleaser] but has failed to stop it. This is very likely to create a memory leak. 8-giu-2017 9.41.12 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads GRAVE: The web application [/ImageProcessor] appears to have started a thread named [CommunicatorServer] but has failed to stop it. This is very likely to create a memory leak.

moskino11
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  • Possible duplicate of [To prevent a memory leak, the JDBC Driver has been forcibly unregistered](https://stackoverflow.com/questions/3320400/to-prevent-a-memory-leak-the-jdbc-driver-has-been-forcibly-unregistered) – Joe Dec 27 '17 at 11:28

1 Answers1

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The issue is that "oracle.jdbc.driver.BlockSource.ThreadedCachingBlockSource.BlockReleaser" thread is running and it is not stopping so Tomcat will show it as a memory leak. You have to deregister the drivers manually. See the link below to get insight.

https://stackoverflow.com/a/5315467/7083879

dhruv joshi24
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