[JCS-194] NullPointerException in IndexedDiskCache.addToRecycleBin(...)

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: jcs-2.2
• Fix Version/s: jcs-3.0
• Component/s: Indexed Disk Cache
• Assignee: Thomas Vandahl
• Reporter: Benedikt Köppel
• Created: 29/Jul/18 13:02
• Updated: 21/Aug/20 13:19
• Resolved: 15/May/19 12:47

Description

Note: this is not the same as https://issues.apache.org/jira/browse/JCS-158, which has already been fixed in the jcs-2.2 version used here.

With the attached mini-project, we get a NullPointerException when the cache is loaded from disk:

java.lang.NullPointerException
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.addToRecycleBin(IndexedDiskCache.java:1145)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache$LRUMapSizeLimited.processRemovedLRU(IndexedDiskCache.java:1738)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache$LRUMapSizeLimited.processRemovedLRU(IndexedDiskCache.java:1637)
at org.apache.commons.jcs.utils.struct.AbstractLRUMap.put(AbstractLRUMap.java:344)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache$LRUMapSizeLimited.put(IndexedDiskCache.java:1685)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache$LRUMapSizeLimited.put(IndexedDiskCache.java:1637)
at org.apache.commons.jcs.utils.struct.AbstractLRUMap.putAll(AbstractLRUMap.java:187)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.loadKeys(IndexedDiskCache.java:339)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.initializeStoreFromPersistedData(IndexedDiskCache.java:285)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.initializeKeysAndData(IndexedDiskCache.java:250)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCache.<init>(IndexedDiskCache.java:183)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory.createCache(IndexedDiskCacheFactory.java:60)
at org.apache.commons.jcs.auxiliary.disk.indexed.IndexedDiskCacheFactory.createCache(IndexedDiskCacheFactory.java:33)
at org.apache.commons.jcs.engine.control.CompositeCacheConfigurator.parseAuxiliary(CompositeCacheConfigurator.java:500)
at org.apache.commons.jcs.engine.control.CompositeCacheConfigurator.parseRegion(CompositeCacheConfigurator.java:261)
at org.apache.commons.jcs.engine.control.CompositeCacheConfigurator.parseRegion(CompositeCacheConfigurator.java:161)
at org.apache.commons.jcs.engine.control.CompositeCacheConfigurator.parseRegions(CompositeCacheConfigurator.java:136)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.doConfigure(CompositeCacheManager.java:490)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.configure(CompositeCacheManager.java:441)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.configure(CompositeCacheManager.java:391)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.configure(CompositeCacheManager.java:373)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.configure(CompositeCacheManager.java:362)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.getInstance(CompositeCacheManager.java:190)
at org.apache.commons.jcs.engine.control.CompositeCacheManager.getInstance(CompositeCacheManager.java:161)
at org.apache.commons.jcs.JCS.getCacheManager(JCS.java:172)
at org.apache.commons.jcs.JCS.getInstance(JCS.java:190)
at ch.locatee.test.App.main(App.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:282)
at java.lang.Thread.run(Thread.java:748)

 

This does not happen if (in my mini project), all the objects are the same size. It seems like the last element inserted into the cache has to be much bigger.