I got into an infinite loop (at least 50) of "Internal error" dialog while
writing the following code

    public String toString ()
    {
        return "[ActivityPeriodPair:"+ __activity.toString() + + __period.
+"]";
    }


Closing and reopening IDEA didn't help.
I had to modify it to (see below) with an editor, and relaunch IDEA to get
out of the loop.
    public String toString ()
    {
//        return "[ActivityPeriodPair:"+ __activity.toString() + + __period.
+"]";
return null;
    }



Alain Ravet



[  39328]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  39328]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  39343]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  39343]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  39343]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  39343]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  39953]  ERROR - intellij.plugins.PluginManager -
[  39953]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  39953]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  39968]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  39968]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  39968]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  39968]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  40671]  ERROR - intellij.plugins.PluginManager -
[  40671]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  40671]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  40687]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  40687]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  40687]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  40687]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  41375]  ERROR - intellij.plugins.PluginManager -
[  41375]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  41375]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  41390]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  41390]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  41390]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  41390]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  42078]  ERROR - intellij.plugins.PluginManager -
[  42078]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  42078]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  42078]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  42078]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  42078]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  42078]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  42953]  ERROR - intellij.plugins.PluginManager -
[  42953]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  42953]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  42953]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  42953]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  42953]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  42953]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  43875]  ERROR - intellij.plugins.PluginManager -
[  43875]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  43875]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  43890]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  43890]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  43890]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  43890]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  44593]  ERROR - intellij.plugins.PluginManager -
[  44593]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  44593]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  44609]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  44609]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  44609]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  44609]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  45187]  ERROR - intellij.plugins.PluginManager -
[  45187]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  45187]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  45203]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  45203]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  45203]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  45203]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  45734]  ERROR - intellij.plugins.PluginManager -
[  45734]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  45734]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  45750]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  45750]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  45750]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  45750]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  46328]  ERROR - intellij.plugins.PluginManager -
[  46328]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  46328]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  46359]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  46359]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  46359]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  46359]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)
[  49468]  ERROR - intellij.plugins.PluginManager -
[  49468]  ERROR - intellij.plugins.PluginManager - IntelliJ IDEA (Ariadna)
Build #614
[  49468]  ERROR - intellij.plugins.PluginManager - JDK: 1.3.1_02
[  49484]  ERROR - intellij.plugins.PluginManager - VM: Java HotSpot(TM)
Client VM
[  49484]  ERROR - intellij.plugins.PluginManager - Vendor: Sun Microsystems
Inc.
[  49484]  ERROR - intellij.plugins.PluginManager - OS: Windows 2000
[  49484]  ERROR - intellij.plugins.PluginManager -
java.lang.NullPointerException
        at com.intellij.psi.impl.source.by.d(by.java:23)
        at com.intellij.psi.impl.source.t.d(t.java:33)
        at com.intellij.psi.impl.source.t.d(t.java:21)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:82)
        at com.intellij.codeInsight.daemon.impl.ch.a(ch.java:297)
        at com.intellij.psi.impl.source.cg.a(cg.java:12)
        at com.intellij.codeInsight.daemon.impl.i.a(i.java:95)
        at com.intellij.codeInsight.daemon.impl.i.run(i.java:59)
        at com.intellij.psi.impl.q.run(q.java:0)
        at
com.intellij.vfs.VirtualFileManager.a(VirtualFileManager.java:136)
        at com.intellij.psi.impl.z.b(z.java:198)
        at com.intellij.codeInsight.daemon.impl.cn.b(cn.java:6)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:26)
        at com.intellij.codeInsight.daemon.impl.cn.a(cn.java:51)
        at com.intellij.codeInsight.daemon.impl.bw.run(bw.java:2)
        at com.intellij.progress.ProgressManager.a(ProgressManager.java:18)
        at com.intellij.codeInsight.daemon.impl.cn.run(cn.java:25)



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