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$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.drools.rule.PackageCompilationData$PackageClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.drools.common.ObjectInputStreamWithLoader.resolveClass(Unknown Source) at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source) at java.io.ObjectInputStream.readClassDesc(Unknown Source) at java.io.ObjectInputStream.readArray(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.defaultReadFields(Unknown Source) at java.io.ObjectInputStream.readSerialData(Unknown Source) at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at java.util.HashMap.readObject(Unknown Source) at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at java.io.ObjectStreamClass.invokeReadObject(Unknown Source) at java.io.ObjectInputStream.readSerialData(Unknown Source) at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at org.drools.rule.PackageCompilationData.readExternal(Unknown Source) at java.io.ObjectInputStream.readExternalData(Unknown Source) at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source) at java.io.ObjectInputStream.readObject0(Unknown Source) at java.io.ObjectInputStream.readObject(Unknown Source) at org.drools.rule.Package.readExternal(Unknown Source) at com.cisco.cp.engine.util.CPRuleUtil$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; } ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs