[rules-users] java.lang.ClassNotFoundException: [Lorg.drools.rule.Declaration;

[Edson Tirelli]

   Why don't you use DroolsObjectInputStream to deserialize it? Check the
integration tests on how to do it.

   []s
   Edson

2007/12/6, Manan Gosalia <goldenmask13 at yahoo.com>:
>
> Hello,
>
> I am trying to deserialize rule package from disk. However, I am getting
> the following exception. I have also included the code that I use to
> deserialize rule packages. I found only one link on the web that describes
> this issue after looking around:
> http://www.mail-archive.com/user@drools.codehaus.org/msg01731.html. But
> there was no solution or help there. Any idea?
>
> I am using drools 3.0.5 and Java 1.5.
>
> Caused by: java.lang.ClassNotFoundException: [Lorg.drools.rule.Declaration
> ;
> at java.net.URLClassLoader$1.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net <http://java.net.urlclassloader.fi/>.URLClassLoader.findClass(Unknown
> Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at org.drools.rule.PackageCompilationData$PackageClassLoader.loadClass(Unknown
> Source)
> at java.lang.ClassLoader.loadClass(Unknown Source)
> at org.drools.common.ObjectInputStreamWithLoader.resolveClass(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readNonProxyDesc(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readClassDesc(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readArray(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject0(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.de/>.ObjectInputStream.defaultReadFields(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readSerialData(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readOrdinaryObject(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject0(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject(Unknown
> Source)
> at java.util.HashMap.readObject(Unknown Source)
> at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
> at java.lang.reflect.Method.invoke(Unknown Source)
> at java.io <http://java.io.objectstreamclass.in/>.ObjectStreamClass.invokeReadObject(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readSerialData(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readOrdinaryObject(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject0(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject(Unknown
> Source)
> at org.drools.rule.PackageCompilationData.readExternal(Unknown Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readExternalData(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readOrdinaryObject(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject0(Unknown
> Source)
> at java.io <http://java.io.objectinputstream.re/>.ObjectInputStream.readObject(Unknown
> Source)
> at org.drools.rule.Package.readExternal(Unknown Source)
> at com.cisco.cp.engine.util.CPRuleUtil$CPRuleFileHelper.getRulePackage(
> CPRuleUtil.java:654)
> ... 26 more
>
>
>
> private Package getRulePackage(File file) throws Exception {
>     // Make sure file is a valid rule file with the proper rule file
>     // ... type.
>     if(file == null) {
>         throw new Exception("File argument is null");
>     }
>     if(!file.exists()) {
>         throw new Exception("File does not exist");
>     }
>
>     FileInputStream ruleFileInputStream = null;
>     ObjectInputStream ruleObjectInputStream = null;
>     Reader ruleFileReader = null;
>     Package rulePackage = null;
>
>     try {
>         rulePackage = new Package();
>         // If the rule file is already compiled, then we just have
>         // ... read it through object input stream.
>         ruleFileInputStream = new FileInputStream(file);
>         ruleObjectInputStream =
>             new ObjectInputStream(ruleFileInputStream);
>         rulePackage.readExternal(ruleObjectInputStream);
>         // Validate the package - this will throw exception if there
>         // ... were any error in the package.
>         rulePackage.checkValidity();
>     }
>     finally {
>         if (rulePackage != null &&
>                 rulePackage.getErrorSummary() != null &&
>                 !rulePackage.getErrorSummary().equals("")) {
>             System.out.println("RULE FILE ERRORS: " +
>             rulePackage.getErrorSummary());
>         }
>         if (ruleObjectInputStream != null) {
>             ruleObjectInputStream.close();
>         }
>         if (ruleFileInputStream != null) {
>             ruleFileInputStream.close();
>         }
>         if (ruleFileReader != null) {
>             ruleFileReader.close();
>         }
>     }
>     return rulePackage;
> }
>
>
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>


-- 
  Edson Tirelli
  JBoss Drools Core Development
  Office: +55 11 3529-6000
  Mobile: +55 11 9287-5646
  JBoss, a division of Red Hat @ www.jboss.com
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