Create Components ?

Christofer Dutz Sat, 16 Feb 2002 11:07:11 -0800

Hi again.

I hope this is the right newsgroup for this kind of question, but I couldn’t see any similar threads in Cocoon-User.

I have tried looking through several sources, but I couldn’t find some sort of HowTo for writing own components. I have tried creating one by having a look at the hsqldb Classes, but I can’t get the thing to work. Every time I add the attribute for a user-role in the cocoon.xconf file, but I always get a “java.lang.NullPointerException” in the /WEB-INF/cocoon.log.000001 file

Here the soure for my roles file :

<?xml version="1.0"?>

<role-list>

�� <role name="org.apache.cocoon.components.exist.Exist" shorthand="exist-server" default-class="org.apache.cocoon.components.exist.ExistImpl"/>

</role-list>

And the config-part of my cocoon.xconf :

...

�� <exist-server class="org.apache.cocoon.components.ExistImpl" pool-max="1" pool-min="1">

�� <parameter name="http-port" value="8010"/>

�� <parameter name="rpc-port" value="8011"/>

�� </exist-server>

…

I have created two classes :

1. org.apache.cocoon.components.exist.Exist :

package org.apache.cocoon.components.exist;

import org.apache.avalon.framework.component.Component;

public interface Exist extends Component {

�� String ROLE = "org.apache.cocoon.components.exist.Exist";

}

2. org.apache.cocoon.components.exist.ExistImpl :

package org.apache.cocoon.components.exist;

import org.apache.avalon.framework.activity.Startable;

import org.apache.avalon.framework.context.Context;

import org.apache.avalon.framework.context.ContextException;

import org.apache.avalon.framework.context.Contextualizable;

import org.apache.avalon.framework.logger.AbstractLoggable;

import org.apache.avalon.framework.parameters.Parameters;

import org.apache.avalon.framework.parameters.Parameterizable;

import org.apache.avalon.framework.thread.ThreadSafe;

import org.apache.cocoon.Constants;

import java.io.File;

import java.io.IOException;

import java.net.MalformedURLException;

import java.sql.SQLException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.Statement;

import java.util.Enumeration;

import org.exist.ServerBean;

/**

�*� �berschrift: eXist XML-Datenbankerweitrung um Lokle Interfaces Beschreibung:

�*

�*@author�� Christofer Dutz

�*@created�� 14. Februar 2002

�*@version�� 1.0

�*/

public class ExistImpl extends AbstractLoggable implements Exist,

�� Parameterizable,

�� Contextualizable,

�� ThreadSafe,

�� Runnable,

�� Startable {

�� private ServerBean server = null;

�� /**

�� *� Initialize the ServerImpl. A few options can be used :

�� *� <UL>

�� *�� <LI> http-port = port where the http-server is listening</LI>

�� *�� <LI> rpc-port = port where the rpc-server is listening</LI>

�� *� </UL>

�� *

�� *@param� params� Description of the Parameter

�� */

�� public void parameterize(Parameters params) {

�� if (this.getLogger().isDebugEnabled()) {

�� this.getLogger().debug("Parameterize ServerImpl");

�� }

�� this.server = ServerBean.getInstance();

�� this.server.setHttpPort(params.getParameterAsInteger("http-port", 0));

�� this.server.setRpcPort(params.getParameterAsInteger("rpc-port", 0));

�� if (this.getLogger().isDebugEnabled()) {

�� this.getLogger().debug("Configure ServerImpl" +

�� ((params.getParameterAsInteger("with http-port", 0) == 0) ? " http-port : " + params.getParameter("http-port", "0") : "") +

�� ((params.getParameterAsInteger("with rpc-port", 0) == 0) ? " rpc-port : " + params.getParameter("rpc-port", "0") : ""));

�� }

�� /**

�� *� Contextualize this class

�� *

�� *@param� context�� Description of the Parameter

�� *@exception� ContextException� Description of the Exception

�� */

�� public void contextualize(Context context) throws ContextException {

�� org.apache.cocoon.environment.Context ctx =

�� (org.apache.cocoon.environment.Context) context.get(Constants.CONTEXT_ENVIRONMENT_CONTEXT);

�� try {

�� String dbPath = new File(ctx.getRealPath("/WEB-INF/xmldb")).getCanonicalPath();

�� this.server.setHome(dbPath);

�� if (this.getLogger().isDebugEnabled()) {

�� this.getLogger().debug("database is : " + dbPath);

�� }

�� } catch (MalformedURLException mue) {

�� getLogger().error("MalformedURLException - Could not get database directory ", mue);

�� } catch (IOException ioe) {

�� this.getLogger().error("IOException - Could not get database directory ", ioe);

�� }

�� /**

�� *� Start the server

�� */

�� public void start() {

�� if (!this.server.isActive()) {

�� this.server.startup();

�� }

�� /**

�� *� Stop the server

�� */

�� public void stop() {

�� if (this.server.isActive()) {

�� this.server.shutdown();

�� }

�� /**

�� *� Main processing method for the ServerImpl object

�� */

�� public void run() {

�� if (!this.server.isActive()) {

�� this.server.startup();

�� }

}

The result I get in the log-file is :

DEBUG�� (2002-02-15) 17:44.22:287�� [cocoon� ] (Unknown-URI) Unknown-thread/Cocoon: Root configuration: cocoon

DEBUG�� (2002-02-15) 17:44.22:287�� [cocoon� ] (Unknown-URI) Unknown-thread/Cocoon: Configuration version: 2.0

DEBUG�� (2002-02-15) 17:44.22:297�� [cocoon� ] (Unknown-URI) Unknown-thread/DefaultComponentFactory: ComponentFactory creating new instance of org.apache.cocoon.components.parser.JaxpParser.

DEBUG�� (2002-02-15) 17:44.22:297�� [cocoon� ] (Unknown-URI) Unknown-thread/JaxpParser: Looking up org.apache.cocoon.components.resolver.Resolver

DEBUG�� (2002-02-15) 17:44.22:297�� [cocoon� ] (Unknown-URI) Unknown-thread/ExcaliburComponentManager: Could not find ComponentHandler, attempting to create one for role: org.apache.cocoon.components.resolver.Resolver

DEBUG�� (2002-02-15) 17:44.22:297�� [cocoon� ] (Unknown-URI) Unknown-thread/JaxpParser: JaxpParser: Could not yet find org.apache.cocoon.components.resolver.Resolver

ERROR�� (2002-02-15) 17:44.22:297�� [cocoon� ] (Unknown-URI) Unknown-thread/Cocoon: Could not configure Cocoon environment

java.lang.NullPointerException

�� at org.apache.cocoon.Cocoon.configure(Cocoon.java:341)

�� at org.apache.cocoon.Cocoon.initialize(Cocoon.java:197)

�� at org.apache.cocoon.servlet.CocoonServlet.createCocoon(CocoonServlet.java:864)

�� at org.apache.cocoon.servlet.CocoonServlet.init(CocoonServlet.java:220)

�� at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:852)

�� at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3267)

�� at org.apache.catalina.core.StandardContext.start(StandardContext.java:3384)

�� at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:785)

�� at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:454)

�� at org.apache.catalina.core.StandardHost.install(StandardHost.java:712)

�� at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:599)

�� at org.apache.catalina.startup.HostConfig.start(HostConfig.java:777)

�� at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:463)

�� at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:155)

�� at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1131)

�� at org.apache.catalina.core.StandardHost.start(StandardHost.java:612)

�� at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1123)

�� at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:307)

�� at org.apache.catalina.core.StandardService.start(StandardService.java:388)

�� at org.apache.catalina.core.StandardServer.start(StandardServer.java:505)

�� at org.apache.catalina.startup.Catalina.start(Catalina.java:776)

�� at org.apache.catalina.startup.Catalina.execute(Catalina.java:681)

�� at org.apache.catalina.startup.Catalina.process(Catalina.java:179)

�� at java.lang.reflect.Method.invoke(Native Method)

�� at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:243)

DEBUG�� (2002-02-15) 17:44.22:297�� [cocoon� ] (Unknown-URI) Unknown-thread/DefaultComponentFactory: ComponentFactory decommissioning instance of org.apache.cocoon.components.parser.JaxpParser.

Have I missed configuring anything ? Or have I done something wrong ? I simply can’t get any usefull information from the log L

Plese help me ( or redirect me if this doesn’t belong here )

Thanx in advance,

�� Christofer Dutz

Christofer Dutz

C-Ware IT-Service

Inh. Christofer Dutz

Goethestr. 18

64372 Ober-Ramstadt

Create Components ?

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