Can I use multiple coherence instances on one JVM?

Question

Or can I explicitly designate a tangosol-coherence-override.xml to coherence? If I can, how to?
Thanks.
Edited by: user8028833 on May 31, 2010 1:35 AM

Answer 1

OK apologies as I was going to just post the bits of code but I didn't get much time last night.
This code was originally written by a couple of us who wrote some security and single sign on code for Coherence. The project is on Google Code here: http://code.google.com/p/coherence-security/
The source is a Maven project so it follows the Maven directory structure. If you look in the coherence-security-core test sources there is a package called com.oracle.coherence.patterns.security.test.starter which contains all the ClassLoader code and classes to start a Coherence "cluster" in a single JVM.
The com.oracle.coherence.patterns.security.ApacheDirectoryTest test class uses this code to start a cluster to run its unit tests. To start the cluster you call CoherenceClusterStarter.getInstance() for example the com.oracle.coherence.patterns.security.ApacheDirectoryTest testSecureClientWithUnauthorisedCredentials() method.
    @Test
    public void testSecureClientWithUnauthorisedCredentials() throws Throwable {
        // Set the main class that runs to be the Secure servers
        System.setProperty("coherence.incubator.mainclass", SecureSandboxStarter.class.getName());
        // Make sure the cluster members run with the [email protected] Principal
        System.setProperty("sun.security.krb5.principal", "[email protected]");
        CoherenceClusterStarter.getInstance();
        // Run the client as the Thomas the Tank identity ([email protected]) which is
        // not authorised to connect as an Extend client in the extend-permissions.xml file
        System.setProperty("sun.security.krb5.principal", "[email protected]");
        LoginContext lc = new LoginContext("Coherence");
        lc.login();
        Subject subject = lc.getSubject();
        try {
            Subject.doAs(subject, new PrivilegedExceptionAction<Object>(){
                public Object run() throws Exception {
                    SystemPropertyLoader.loadEnvironment("client");
                    System.setProperty("tangosol.coherence.security", "true");
                    CacheFactory.getCache("test");
                    return null;
            fail("Expected to have a PortableException wrapping a java.lang.SecurityException thrown");
        } catch (PortableException e) {
            assertEquals("Portable(java.lang.SecurityException)", e.getName());
    }In the code above the first line sets the coherence.incubator.mainclass System property to the name of the class that will be run (in this case our secured DefaultCacheServer wrapper). Then the next line starts the psuedo-Cluster which the rest of the code uses.
Note
The Google Code above was originally done due to a requierment to secure Coherence using Active Directory (Kerberos). The code was started on 3.4 and eventually on 3.5.3 and then used to help Oracle change the Security API for 3.6. There are a few things not quite right and a few "gotchas" that are not in the code online.
Anyone is welcome to take it and use it but I and the others who worked on it offer no warranty or guarantee it will work for you.
As of Coherence 3.6 there are much simpler ways to do security - although if you want to use Active Directory or Kerberos some of the code on Google will still be useful.
Any problems or questions give me a shout either here or mail [email protected].
Regards
JK