java - IllegalStateException: zip file closed during file write -

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this bug occurs when program enters shutdown hook , tries write settings file text document. strange thing is, doesnt throw exception everytime.

exception in thread "thread-4" java.lang.illegalstateexception: zip file closed     @ java.util.zip.zipfile.ensureopen(unknown source)     @ java.util.zip.zipfile.getentry(unknown source)     @ java.util.jar.jarfile.getentry(unknown source)     @ java.util.jar.jarfile.getjarentry(unknown source)     @ com.crimson.server.jarclassloader.findjarentry(jarclassloader.java:514)     @ com.crimson.server.jarclassloader.findjarclass(jarclassloader.java:584)     @ com.crimson.server.jarclassloader.loadclass(jarclassloader.java:956)     @ java.lang.classloader.loadclass(unknown source)     @ com.crimson.universalutils.datastore.store(datastore.java:66)     @ com.crimson.server.servershutdownhook.run(servershutdownhook.java:38)

here datastore.store(settings):

public static file set = new file("settings.properties");  public static void store(settings settings){     set.delete();      try {         set.createnewfile();         printwriter pw = new printwriter(set);//line 66         pw.println(objecttransfer.tostring(settings));          pw.close();     } catch (filenotfoundexception e) {         // todo auto-generated catch block         e.printstacktrace();     } catch (ioexception e) {         // todo auto-generated catch block         e.printstacktrace();     }  }

i dont know why creating printwriter calls classloader.loadclass, problem because im using jarclassloader: http://www.jdotsoft.com/jarclassloader.php

i checked source code of jarclassloader , problem jarclassloader has shutdown hook close jar file. , documentation of shutdown hooks says, may invoked in order, or in parallel. when hook "gets in" before jarclassloaders, code works. when it's bit late, exception.

a way around ensure printwriter class loaded before invoking shutdown hook.


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