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Another common problem related to Java is that, sometimes, certain environment variables are not defined at Java installation time. For instance, Geronimo requires JAVA_HOME and JRE_HOME to be defined before running the server. As a convenience, make sure you also add <JAVA_HOME>/bin directory to the system PATH.
About JVM size, try the following configuration to reset heap size if you are encountering an OutOfMemoryException Exception:
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set JAVA_OPTS=-XX:PermSize=256m -XX:MaxPermSize=256m -Xms512m -Xmx1024m
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Port conflicts
The second most common startup issue is associated to port conflicts, check no other application is using or blocking Geronimo's default ports:
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