NullPointerException in Catalina StandardClassLoader when JAR with no manifest is added to one of the lib directories

[Roytman, Alex]

NullPointerException in  Catalina StandardClassLoader when JAR with no manifest is added  to one of the lib directories Adding manifest to the jar fixes the problem   D:\java\apache\tomcat4\bin>catalina run Using CLASSPATH: d:\java\apache\tomcat4\bin\bootstrap.jar;c:\java\jdk\lib\tools.jar java.lang.NullPointerException         at org.apache.catalina.loader.Extension.getAvailable(Extension.java:300)         at org.apache.catalina.loader.    .addRepositoryInternal(StandardClassLoader.java:1133)         at org.apache.catalina.loader.StandardClassLoader.<init>(StandardClassLoader.java:219)         at org.apache.catalina.startup.Bootstrap.createCatalinaLoader(Bootstrap.java:328)         at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:121) Exception in thread "main" java.lang.IllegalArgumentException: addRepositoryInternal: java.lang.NullPointerException         at org.apache.catalina.loader.StandardClassLoader.addRepositoryInternal(StandardClassLoader.java:1145)         at org.apache.catalina.loader.StandardClassLoader.<init>(StandardClassLoader.java:219)         at org.apache.catalina.startup.Bootstrap.createCatalinaLoader(Bootstrap.java:328)         at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:121) D:\java\apache\tomcat4\bin>