implementing custom JDBCRealm, classloader problem

[Jarl Aanonsen <ja...@masterpieces.no>]

I am using Tomcat 4.0.

I have started development of a custom JDBCRealm (MyJDBCRealm extends
org.apache.catalina.realm.JDBCRealm).
MyJDBCRealm overrides the JDBCRealm method authenticate(String username,
String credentials).

First, CLASSPATH is extended to include catalina.jar in /server/lib (for
compilation purposes).

Second, the com.mycompany.MyJDBCRealm.java is compiled and MyJDBC.class file
is placed in
/common/classes/no/mycompany.

Third, in the server.xml file the className attribute in the relevant Realm
tag is changed from
"org.apache.catalina.realm.JDBCRealm" to
"no.mycompany.MyJDBCRealm".

Then, the execution of startup.bat gives the following message:
Using CATALINA_BASE: ..
Using CATALINA_HOME: ..
Using CLASSPATH: ..\bin\bootstrap.jar;c:\j2sdk1.4.1_02\lib\tools.jar
Using JAVA_HOME: c:\j2sdk1.4.1_02
Exception during startup processing
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Unknown Source)
Caused by: java.lang.NoClassDefFoundError:
org/apache/catalina/realm/JDBCRealm
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:502)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:250)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at org.apache.catalina.loader.StandardClassLoader.findClass(Unknown Source)
at org.apache.catalina.loader.StandardClassLoader.loadClass(Unknown Source)
at org.apache.catalina.loader.StandardClassLoader.loadClass(Unknown Source)
at org.apache.catalina.loader.StandardClassLoader.loadClass(Unknown Source)
at org.apache.catalina.loader.StandardClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at org.apache.catalina.util.xml.ObjectCreate.start(Unknown Source)
at org.apache.catalina.util.xml.XmlMapper.matchStart(Unknown Source)
at org.apache.catalina.util.xml.XmlMapper.startElement(Unknown Source)
at
org.xml.sax.helpers.XMLReaderAdapter.startElement(XMLReaderAdapter.java:329)
at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1451)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)
at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)
at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)
at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)
at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)
at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:499)
at org.apache.crimson.parser.Parser2.parse(Parser2.java:304)
at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:433)
at org.xml.sax.helpers.XMLReaderAdapter.parse(XMLReaderAdapter.java:223)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:317)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:260)
at org.apache.catalina.util.xml.XmlMapper.readXml(Unknown Source)
at org.apache.catalina.startup.Catalina.start(Unknown Source)
at org.apache.catalina.startup.Catalina.execute(Unknown Source)
at org.apache.catalina.startup.Catalina.process(Unknown Source)
... 5 more

Can anyone tell me why this occurs?

Best regards
jarla
jarla@netcom.no


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