6:01 a.m.
jBPM Classloading
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Key: JBPM-1148
URL: http://jira.jboss.com/jira/browse/JBPM-1148
Project: JBoss jBPM
Issue Type: Patch
Components: Core Engine
Reporter: Bjoern Wand
Assigned To: Tom Baeyens
jBPM does not use ContextClassloader for classloading. The class ClassLoaderUtil.java has
a comment that class loading could be made configurable. This is the patch I provided in
the forum and I agreed with Koen Ars th open a JIRA for this.
package org.jbpm.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jbpm.JbpmConfiguration;
import org.jbpm.JbpmException;
import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.instantiation.ProcessClassLoader;
/**
* provides centralized classloader lookup.
*/
public class ClassLoaderUtil {
private static Log log = LogFactory.getLog(ClassLoaderUtil.class);
public static Class loadClass(String className) {
try {
return getClassLoader().loadClass(className);
} catch (ClassNotFoundException e) {
throw new JbpmException("class not found '" + className +
"'", e);
}
}
public static ClassLoader getClassLoader() {
if (JbpmConfiguration.Configs.hasObject("jbpm.classloader")) {
String jbpmClassloader =
JbpmConfiguration.Configs.getString("jbpm.classloader");
String jbpmClassloaderClassname =
JbpmConfiguration.Configs.getString("jbpm.classloader.classname");
if (jbpmClassloader.equals("jbpm")) {
return ClassLoaderUtil.class.getClassLoader();
} else if (jbpmClassloader.equals("context")) {
return Thread.currentThread().getContextClassLoader();
} else if (jbpmClassloader.equals("custom")) {
try {
if (jbpmClassloaderClassname == null) {
throw new JbpmException(
"'jbpm.classloader' property set to
'custom' but 'jbpm.classloader.classname' is empty!");
}
return (ClassLoader)
Thread.currentThread().getContextClassLoader().loadClass(
jbpmClassloaderClassname).newInstance();
} catch (InstantiationException e) {
throw new JbpmException("Error instantiating custom classloader
" + jbpmClassloaderClassname, e);
} catch (IllegalAccessException e) {
throw new JbpmException("Error accessing custom classloader
" + jbpmClassloaderClassname, e);
} catch (ClassNotFoundException e) {
throw new JbpmException("Custom classloader " +
jbpmClassloaderClassname + " not found ", e);
}
} else {
throw new JbpmException("'jbpm.classloader' property set to
'" + jbpmClassloader
+ "' but only the values
'jbpm'/'context'/'custom' are supported!");
}
} else {
return ClassLoaderUtil.class.getClassLoader();
}
}
public static InputStream getStream(String resource) {
return getClassLoader().getResourceAsStream(resource);
}
public static Properties getProperties(String resource) {
Properties properties = new Properties();
try {
properties.load(getStream(resource));
} catch (IOException e) {
throw new JbpmException("couldn't load properties file '" +
resource + "'", e);
}
return properties;
}
/**
* searches the given resource, first on the root of the classpath and if
* not not found there, in the given directory. public static InputStream
* getStream(String resource, String directory) { InputStream is =
* getClassLoader().getResourceAsStream(resource); if (is==null) { is =
* getClassLoader().getResourceAsStream(directory+"/"+resource); } return
* is; }
*
* public static Properties getProperties(String resource, String directory) {
* Properties properties = new Properties(); try {
* properties.load(getStream(resource, directory)); } catch (IOException e) {
* throw new JbpmException("couldn't load properties file
'"+resource+"'",
* e); } return properties; }
*/
public static ClassLoader getProcessClassLoader(ProcessDefinition processDefinition)
{
return new ProcessClassLoader(getClassLoader(), processDefinition);
}
}
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