Problem
Any operation in the Flow server (UI or command line), seems to throw a LazyInitializationException like this
| InternalError: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: … followed by a stack trace for action attempted |
Debugging
Files to consider
/conf/wrapper.conf
/logs/commander.log
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Check the available memory in the Host.
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Check the following lines in wrapper.conf that indicate memory allocation:
| # Initial Java Heap Size (in %) wrapper.java.initmemory.percent=50 # Initial Java Heap Size (in mb) #wrapper.java.initmemory=2048 # Maximum Java Heap Size (in %) wrapper.java.maxmemory.percent=50 # Maximum Java Heap Size (in mb) #wrapper.java.maxmemory=4096 |
- Check if the allocated amount of memory matches the values reported in commander.log
–> commander.log contains snippets of memory usage every 15 minutes in this format
| G1 Old Gen usage 293.92 MB 1.724 GB 1.895 GB 2.000 GB G1 Old Gen collection 0 B 0 B 1.895 GB 2.000 GB G1 Old Gen peak 293.92 MB 1.895 GB 1.895 GB 2.000 GB |
–> Make sure G1 Old Gen Max setting matches the % value set in wrapper.conf
Solution
If you notice that Max value does not increase about 2.0 GB, then its because the JVM being used is 32-bit.
Run “uname -a” to get details about the OS itself. If the JVM is 32-bit, the swap space cannot be configured for more than 2GB.
A PAE kernel allows Linux to see all the RAM, but it does not change the fact that each individual process is a 32-bit process, and thus can only run the 32-bit JVM. A 32-bit JVM is constrained to a maximum of 2GB of heap space; there is no way to get around that so the only solution if you need more heap for a single process is to upgrade to a full 64-bit OS that can support the 64-bit JVM.
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