Squirrel not starting fix

If OOM kills squirrel hard, and squirrel will not restart giving a Null Pointer error, you can follow this thread below by removing the SQLAliases23_treeStructure.xml file from your $HOME/.squirrel dir. It is a transient file.

Stack trace:

tor@unwise:~/SQuirreL SQL Client$ ./squirrel-sql.sh
Exception in thread "main" java.lang.reflect.InvocationTargetException
    at java.awt.EventQueue.invokeAndWait(EventQueue.java:997)
    at javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1323)
    at net.sourceforge.squirrel_sql.fw.gui.GUIUtils.processOnSwingEventThread(GUIUtils.java:350)
    at net.sourceforge.squirrel_sql.client.gui.WindowManager.(WindowManager.java:161)
    at net.sourceforge.squirrel_sql.client.Application.executeStartupTasks(Application.java:753)
    at net.sourceforge.squirrel_sql.client.Application.startup(Application.java:246)
    at net.sourceforge.squirrel_sql.client.Main.main(Main.java:60)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
    at net.sourceforge.squirrel_sql.client.gui.db.JTreeAliasesListImpl.initTree(JTreeAliasesListImpl.java:233)
    at net.sourceforge.squirrel_sql.client.gui.db.JTreeAliasesListImpl.(JTreeAliasesListImpl.java:101)
    at net.sourceforge.squirrel_sql.client.gui.db.AliasesList.(AliasesList.java:44)
    at net.sourceforge.squirrel_sql.client.gui.WindowManager.createAliasesListUI(WindowManager.java:877)
    at net.sourceforge.squirrel_sql.client.gui.WindowManager.initialize(WindowManager.java:861)
    at net.sourceforge.squirrel_sql.client.gui.WindowManager.access$200(WindowManager.java:77)
    at net.sourceforge.squirrel_sql.client.gui.WindowManager$1.run(WindowManager.java:165)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:199)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
    at net.sourceforge.squirrel_sql.client.Application$1.dispatchEvent(Application.java:195)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.NullPointerException
    at net.sourceforge.squirrel_sql.client.gui.db.AliasFolderState.applyExpansionAndSelectionToNode(AliasFolderState.java:144)
    at net.sourceforge.squirrel_sql.client.gui.db.AliasFolderState.applyExpansionAndSelection(AliasFolderState.java:160)
    at net.sourceforge.squirrel_sql.client.gui.db.JTreeAliasesListImpl.applyAliasFolderState(JTreeAliasesListImpl.java:264)
    at net.sourceforge.squirrel_sql.client.gui.db.JTreeAliasesListImpl.initTree(JTreeAliasesListImpl.java:220)
    ... 15 more