DRools + SWT/JFace: Unable to create view: org/drools/WorkingMemory

DRools + SWT/JFace: Unable to create view: org/drools/WorkingMemory

im2007
im2007
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发表于：2008-02-09 11:22:36 楼主

我在尝试用SWT/JFace做RCP Based DRools Application, 但是在Run As "Eclipe Application" 的时候调用DRools的View中出现了错误信息"Unable to create view: org/drools/WorkingMemory".

我的相关View代码如下, 如果把 workingMemory = ruleBase.newStatefulSession();注释掉就没有这个错误, 哪位知道这是为什么?

我的这段代码的主要目的是尝试在按一个Button后调用"Hello World" DRools sample.

package com.configurator.rcpexample2.intro;

import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.part.ViewPart;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Button;

import java.io.InputStreamReader;
import java.io.Reader;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;

import com.configurator.rcpexample2.intro.Message;

public class TreeView extends ViewPart {

public static final String ID = "com.configurator.rcpexample2.intro.TreeView"; // TODO Needs to be whatever is mentioned in plugin.xml

private Composite top = null;

private Composite composite = null;

private Composite composite1 = null;

private Button button = null;

private Button button1 = null;

public static RuleBase ruleBase; // @jve:decl-index=0:
public static WorkingMemory workingMemory;
public static Message message = null; // @jve:decl-index=0:

public void createPartControl(Composite parent) {
// TODO Auto-generated method stub
GridLayout gridLayout = new GridLayout();
gridLayout.numColumns = 2;
top = new Composite(parent, SWT.NONE);
top.setLayout(gridLayout);
createComposite();
createComposite1();
}

public void setFocus() {
// TODO Auto-generated method stub

}

/**
* This method initializes composite
*
*/
private void createComposite() {
GridData gridData = new GridData();
gridData.grabExcessHorizontalSpace = true;
gridData.horizontalAlignment = GridData.FILL;
gridData.verticalAlignment = GridData.FILL;
gridData.grabExcessVerticalSpace = true;
composite = new Composite(top, SWT.NONE);
composite.setLayout(new GridLayout());
composite.setLayoutData(gridData);
button = new Button(composite, SWT.NONE);
button.setText("Botton 1");
button.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
System.out.println("widgetSelected()"); // TODO Auto-generated Event stub widgetSelected()
}
});

button.addMouseListener(new org.eclipse.swt.events.MouseAdapter() {

public void mouseUp(org.eclipse.swt.events.MouseEvent e) {
try{
firerule();
} catch (Throwable t) {
t.printStackTrace();
}

System.out.println("mouseUp()"); // TODO Auto-generated Event stub mouseUp()
}
});
}

/**
* This method initializes composite1
*
*/
private void createComposite1() {
GridData gridData1 = new GridData();
gridData1.grabExcessHorizontalSpace = true;
gridData1.horizontalAlignment = GridData.FILL;
gridData1.verticalAlignment = GridData.FILL;
gridData1.grabExcessVerticalSpace = true;
composite1 = new Composite(top, SWT.NONE);
composite1.setLayout(new GridLayout());
composite1.setLayoutData(gridData1);
button1 = new Button(composite1, SWT.NONE);
button1.setText("Botton 2");
}

/**
* Please note that this is the "low level" rule assembly API.
*/
private static RuleBase readRule() throws Exception {
//read in the source
Reader source = new InputStreamReader( TreeView.class.getResourceAsStream( "/Sample.drl" ) );

//optionally read in the DSL (if you are using it).
//Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream( "/mylang.dsl" ) );

//Use package builder to build up a rule package.
//An alternative lower level class called "DrlParser" can also be used...

PackageBuilder builder = new PackageBuilder();

//this wil parse and compile in one step
//NOTE: There are 2 methods here, the one argument one is for normal DRL.
builder.addPackageFromDrl( source );

//Use the following instead of above if you are using a DSL:
//builder.addPackageFromDrl( source, dsl );

//get the compiled package (which is serializable)
Package pkg = builder.getPackage();

//add the package to a rulebase (deploy the rule package).
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );
return ruleBase;
}

private static boolean firerule() throws Exception {

try {

//load up the rulebase
ruleBase = readRule();

workingMemory = ruleBase.newStatefulSession();

//go !
message = new Message();
message.setMessage( "Hello World" );

message.setStatus( Message.HELLO );
/*
workingMemory.insert( message );
workingMemory.fireAllRules();
*/

} catch (Throwable t) {

t.printStackTrace();

}

return true;

}
}

View中的错误信息:

java.lang.NoClassDefFoundError: org/drools/WorkingMemory
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2357)
at java.lang.Class.getConstructor0(Class.java:2671)
at java.lang.Class.newInstance0(Class.java:321)
at java.lang.Class.newInstance(Class.java:303)
at ....

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