Re: Merlin container classloading problem

[Peter Jervgren]

Stephen McConnell wrote:
>Also - what is the embedding scenario?
>Merlin CLI or something special? 
>If its something special - what is in the classloader that is 
launching Merlin.

Hi, (and thanks for interest /regards Peter)
This is the java source for the embedding part (as by the example for 
embedded use)

--- start snippet
package com.euronetics.cappuccino;
import java.io.File;
import java.util.Map;
import org.apache.avalon.repository.Artifact;
import org.apache.avalon.repository.provider.Builder;
import org.apache.avalon.repository.provider.Factory;
import org.apache.avalon.repository.provider.InitialContextFactory;
import org.apache.avalon.repository.provider.InitialContext;
import org.apache.avalon.repository.main.DefaultInitialContextFactory;
/**
* An example of the embedding of a merlin kernel inside a main
* method.  The objective of the example is to demonstrate a
* simple embedded scenario.
*/
public class Cappuccino
{
   public static void main( String[] args ) throws Exception
   {
       //
       // Create the initial context factory.  This establishes
       // the application group from which properties will
       // be resolved. It also provides operations supporting
       // customization of the application environment.
       //
       InitialContextFactory initial =
         new DefaultInitialContextFactory( "merlin" );
       File home = initial.getHomeDirectory();
       initial.setCacheDirectory( new File( home, "system" ) );
       InitialContext context = initial.createInitialContext();
       //
       // Using the initial context we can now load any repository
       // application using an artifact specification. Meta
       // information associated with the artifact is used to
       // construct the classloader that the application needs in
       // order to execute.
       //
   //        String spec = "artifact:merlin/merlin-impl#3.3-SNAPSHOT";
   String group = "merlin";
   String id = "merlin-impl";
   String version = "3.3-SNAPSHOT";
   //        Artifact artifact = Artifact.createArtifact( spec );
       Artifact artifact = Artifact.createArtifact(group, id, version);
       Builder builder = context.newBuilder( artifact );
       //
       // With the classloader established we can go ahead and
       // and get the application factory.  The factory has already
       // been parameterized with defaults derived from properties
       // based on the application group. We can provide
       // overriding values by setting the factory criteria to
       // application specific values following which we instantiate
       // the application.
       //
       Factory factory = builder.getFactory();
       Map criteria = factory.createDefaultCriteria();
   criteria.put( "merlin.server", "false" );
       factory.create( criteria );
   System.out.println("Merlin kernel established for Cappuccino");
   }
}
--- end snippet
and here comes the bootstrap script
--- start snippet
#!/bin/sh
# CLASSPATH
MAVEN_REPOSITORY=/home/petje/.maven/repository
AVALON_REPOSITORY_API=${MAVEN_REPOSITORY}/avalon-repository/jars/avalon-repository-api-2.0-SNAPSHOT.jar
AVALON_REPOSITORY_IMPL=${MAVEN_REPOSITORY}/avalon-repository/jars/avalon-repository-impl-2.0-SNAPSHOT.jar
AVALON_REPOSITORY_MAIN=${MAVEN_REPOSITORY}/avalon-repository/jars/avalon-repository-main-2.0-SNAPSHOT.jar
AVALON_REPOSITORY_SPI=${MAVEN_REPOSITORY}/avalon-repository/jars/avalon-repository-spi-2.0-SNAPSHOT.jar
AVALON_UTIL_I18N=${MAVEN_REPOSITORY}/avalon-util/jars/avalon-util-i18n-1.0.0.jar
AVALON_FRAMEWORK_API=${MAVEN_REPOSITORY}/avalon-framwork/jars/avalon-framework-api-SNAPSHOT.jar
CAPPUCCINO=/home/petje/cappuccino/target/classes
CLASSPATH=${AVALON_REPOSITORY_API}:${AVALON_REPOSITORY_IMPL}:${AVALON_REPOSITORY_MAIN}:${AVALON_REPOSITORY_SPI}:${AVALON_UTIL_I18N}:${AVALON_FRAMEWORK_API}:${CAPPUCCINO}
# EXECUTING CLASS
CLASS=com.euronetics.cappuccino.Cappuccino
echo Starting Cappuccino with...
echo Classpath=${CLASSPATH}
echo Class=${CLASS}
java -cp ${CLASSPATH} ${CLASS}
---- stop snippet
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