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java.lang.NullPointerException

断点 — Mon, 04 Oct 2010 16:39:00 GMT

java.lang.NullPointerException
at jxl.read.biff.File.(File.java:77)
at jxl.Workbook.getWorkbook(Workbook.java:250)
at jxl.Workbook.getWorkbook(Workbook.java:235)
at org.drools.decisiontable.parser.xls.ExcelParser.parseFile(ExcelParser.java:76)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:89)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:68)
at com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java:59)
at com.sample.DecisionTableTest.main(DecisionTableTest.java:36)

Drools调用readDecisionTable()�Ҏ��里面一处�ؓ�Q?br /> InputStream is = DecisionTableTest.class.getResourceAsStream("rules\\Sample.xls");
final String drl = converter.compile( is, InputType.XLS );
需改�ؓ如下�Q�取的class即错误解冟�?br /> InputStream is = DecisionTableTest.class.getClassLoader().getResourceAsStream("rules\\Sample.xls");
final String drl = converter.compile( is, InputType.XLS );

断点 2010-10-05 00:39 发表评论

org.mvel.CompileException: can not resolve identifier: 'declr'

断点 — Mon, 04 Oct 2010 16:32:00 GMT

org.mvel.CompileException: can not resolve identifier: 'declr'
at org.mvel.ASTNode.getReducedValue(ASTNode.java:315)
at org.mvel.ast.PropertyASTNode.getReducedValue(PropertyASTNode.java:29)
at org.mvel.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:103)
at org.mvel.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:51)
at org.mvel.TemplateInterpreter.execute(TemplateInterpreter.java:428)
at org.mvel.TemplateInterpreter.parse(TemplateInterpreter.java:320)
at org.drools.rule.builder.dialect.java.AbstractJavaBuilder.generatTemplates(AbstractJavaBuilder.java:113)
at org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:95)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:67)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:446)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:304)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:167)
at com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java:63)
at com.sample.DecisionTableTest.main(DecisionTableTest.java:36)

替换mvel.jar为mvel14-1.2.10.jar后不再报错，好像是jar包的问题�?br /> 看了下jar包里面的org.mvel.ASTNode.getReducedValue�Ҏ��已经注释掉了�?/span>

断点 2010-10-05 00:32 发表评论

WARNING: Wasn't able to correctly close stream for decision table. nulljava.lang.NullPointerException

断点 — Mon, 04 Oct 2010 16:22:00 GMT

WARNING: Wasn't able to correctly close stream for decision table. nulljava.lang.NullPointerException
at jxl.read.biff.File.(File.java:77)
at jxl.Workbook.getWorkbook(Workbook.java:250)
at jxl.Workbook.getWorkbook(Workbook.java:235)
at org.drools.decisiontable.parser.xls.ExcelParser.parseFile(ExcelParser.java:76)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:89)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:68)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:110)
at com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java:57)
at com.sample.DecisionTableTest.main(DecisionTableTest.java:35)

在web��目中的原先的写法�ؓ�Q?br /> final String drl = converter.compile( "rules\\Sample.xls", InputType.XLS );

参考了下别人的写法�Q�改��Z��面的方式�q�行处理�Q?nbsp;
InputStream is = DecisionTableTest.class.getClassLoader().getResourceAsStream("rules\\Sample.xls");
final String drl = converter.compile( is, InputType.XLS );

断点 2010-10-05 00:22 发表评论

断点 — Mon, 04 Oct 2010 04:00:00 GMT

�׃��drools有新版本了，所以与MyEclipse整合�q�行了解下�?br /> 整合步骤如下�Q?br /> 1、下载MyEclipse 8.5�Q?br /> 2、在http://www.jboss.org/drools/downloads.html下蝲Drools Eclipse 3.5 Workbench 5.1 插�g�Q?br /> 3、在E:\MyEclipse8.5下新�?个文�Ӟ��links、myplugins�?br /> E:\MyEclipse 8.5\links�Q�放drools.link配置文�g�Q�内容�ؓpath=E:\\MyEclipse 8.5\\myplugins\\drools\\
E:\MyEclipse 8.5\myplugins�Q�放drools文�g�Q�该E:\MyEclipse 8.5\myplugins\drools\eclipse下放�|�从�|�上下蝲的drools插�g的features和plugins�?br /> 4、重启MyEclipse 8.5卛_��看见drools图标�?br /> 5、安装Jboss�Q�下载jboss-5.0.0.GA�Q�解压即可�?br /> 打开MyEclipse->window->Preference->MyEclipse->Servers->JBoss->JBoss 5.x�q�行jre及相关配�|��?

断点 2010-10-04 12:00 发表评论

Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath

断点 — Mon, 15 Mar 2010 16:30:00 GMT

在操作Drools的测试例子时�Q�Eclipse后台报以下错误：
org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java'
at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:160)
at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:146)
at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:121)
at org.drools.compiler.PackageBuilderConfiguration.(PackageBuilderConfiguration.java:98)
at org.drools.compiler.PackageBuilder.(PackageBuilder.java:124)
at org.drools.compiler.PackageBuilder.(PackageBuilder.java:86)
at com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java:58)
at com.sample.DecisionTableTest.main(DecisionTableTest.java:35)
Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath
at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:91)
at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:52)
at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:156)
... 7 more

主要是缺��一个jar包：org.eclipse.jdt.core_3.3.1.v_780_R33x.jar而引��L��?br />

断点 2010-03-16 00:30 发表评论

Drools 规则��试

断点 — Wed, 10 Mar 2010 15:00:00 GMT

package rules;

import java.io.InputStream;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.decisiontable.InputType;
import org.drools.decisiontable.SpreadsheetCompiler;
import org.drools.rule.Package;

public class TestPremium {
public static final String path = "rules\\premium\\0326\\02\\030006\\rate.xls";

public static void main(String[] args) throws Exception {
  try {
   RuleBase ruleBase = readDecisionTable();
   WorkingMemory workingMemory = ruleBase.newStatefulSession();
   int flag = path.indexOf("FormulaOrder");
   ElementResultVO r = new ElementResultVO();
   PremiumHelper helper = new PremiumHelper();
   workingMemory.setGlobal("r", r);
   workingMemory.setGlobal("helper", helper);

   AppBaseVO base = new AppBaseVO();
   AppVhlVO vhl = new AppVhlVO();
   AppPrmCoefVO prmCoef = new AppPrmCoefVO();

   base.setCAmtCur("01");
   base.setNAmt(4000000d);

   workingMemory.insert(base);
   workingMemory.insert(vhl);
   workingMemory.insert(prmCoef);

   workingMemory.fireAllRules();

   System.out.println("==========compile success!===========");

  } catch (Exception e) {
   System.out.println("==========compile failure!===========");
   e.printStackTrace();
  }
}

private static RuleBase readDecisionTable() throws Exception {
        final SpreadsheetCompiler converter = new SpreadsheetCompiler();
        InputStream is = TestPremium.class.getClassLoader().getResourceAsStream(path);
          final String drl = converter.compile( is, InputType.XLS );
          PackageBuilder builder = new PackageBuilder();
          builder.addPackageFromDrl( new StringReader( drl ) );
          Package pkg = builder.getPackage();
          RuleBase ruleBase = RuleBaseFactory.newRuleBase();
          ruleBase.addPackage( pkg );
          return ruleBase;
}

}

++++++++++++++++++++++++++++++++++++++
执行后的一部分�Q?br /> #From row number: 369
rule "_369"
salience 65167
activation-group "x"
when
      vhl:AppVhlVO(CUsageCde == "374015", CVhlTyp == "365012",
      eval(helper.getVhlYear(vhl.getCFstRegYm())>=4 && helper.getVhlYear(vhl.getCFstRegYm())<1000))
then
      r.putCoef("rate",0.67);
      r.putField("Table.col","Cvrg.NRate");
end

断点 2010-03-10 23:00 发表评论

Drools��d��Xsl文�g

断点 — Wed, 10 Mar 2010 14:29:00 GMT

package com.premium.rules;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import org.apache.log4j.Logger;
import org.drools.compiler.DroolsParserException;
import org.drools.compiler.PackageBuilder;
import org.drools.decisiontable.InputType;
import org.drools.decisiontable.SpreadsheetCompiler;
import org.drools.rule.Package;

public class DrlPackageManager {

// 用于�~�存Drools的Package�Q�key为Excel的完整�\径，value为此文�g�~�译�q�后的Package
static Map pkgMap = new HashMap();
private static Logger logger = Logger.getLogger(DrlPackageManager.class);

/**
* 通过Excel的文件名�~�存Drools的Package
*
* @param fileName
* @return
* @throws Exception
*/
public static Package getPackageByXsl(String fileName) throws Exception {
  Package pkg = (Package) pkgMap.get(fileName);
  if (pkg != null)
   return pkg;

  final SpreadsheetCompiler converter = new SpreadsheetCompiler();
  InputStream is = null;
  try {
   is = DrlPackageManager.class.getResourceAsStream(fileName);
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   is.close();
   throw new Exception("====��d��规则的资源文�? + fileName + "出错�Q�请��查文�?+ fileName + "=====", e);
  }
  String drl = null;
  try {
   drl = converter.compile(is, InputType.XLS);
   logger.debug("Drools Excel规则文�g�Q? + fileName + "�~�译�?drl文�g的结果："+ drl);
  } catch (Exception e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   is.close();
   throw new Exception("xls文�g�~�译成drl文�g出错", e);
  }

  PackageBuilder builder = new PackageBuilder();
  StringReader srd = new StringReader(drl);
  builder.addPackageFromDrl(srd);
  pkg = builder.getPackage();
  pkgMap.put(fileName, pkg);
  is.close();
  return pkg;
}

}

断点 2010-03-10 22:29 发表评论

Drools 4.0

断点 — Wed, 10 Mar 2010 13:43:00 GMT

1、Drools是什�?
Drools 是一个基于Charles Forgy's的Rete��法的，专�ؓJava语言所设计的规则引擎。Rete��法应用于面向对象的接口��Z��商业对象的商业规则的表达更�ؓ自然。Drools是用Java写的�Q�但能同时运行在Java�?Net上�?/p>

一路到底的框架�Q?br /> 大多数开发者都有自己喜��q��框架。无特定��序�Q�它们包括表现层框架�Q�Struts, JSF, Cocoon和Spring�Q?持久化框�Ӟ��JDO, Hibernate, Cayenne and Entity Beans�Q�以及结构框�?EJB, 又是Spring, Pico和Excalibur), �q�有其它很多。每�U�框枉��各有所长，�l�开发者提供子许多“卛_��即用”的功能。��用框架来部��v应用意味着你避免了许多让�h厌烦的细节，让你集中注意力到关键之处�?br /> 到目前�ؓ��_��在框架所能做的事中仍然有一个缺口，那就是商业逻辑没有框架。像EJB和Spring�q�样的工兯��好，但它们却几乎没有提及怎么�l�织你的那些if …then语句。把Drools加到你的开发工��L��中意味着现在你可�?#8220;一路到�?#8221;的��用框架来构徏你的应用�E�序�?/p>

2.Drools4.0版本�Q?/span>
JBoss Drools是一�Ƒּ�源的业务规则引擎�Q�目前已�l�发布了4.0版本。在4.0版本中主要的特色和改�q�如下：
1.更高的性能�Q�较之于之前的版本，Drools 4.0更�ؓ高效�q�且占用更少的内存空间。内部的性能��试表明�Q�性能的提升已�l�从几分钟羃减�ؓ若干�U�钟�?
2.提升的表达能力：当前的发布版引入了更为强大且的业务行��本语�a��Q�MVFlex表达式语�a��Q��?br /> 3.友好的业务分析工��P��一个具备向导功能的规则�~�辑器的增加�Q��得非�E�序员用户可以设计复杂的业务规则�Q��ƈ在没有编写�Q何代码的情况下自动绑定企业数据。提供带有菜单提�C�和下拉列表的向导来帮助用户完成设计�q�程�?
4.规则��的能力�Q�可视化的徏模技术可以��用户声明式地为相应规则的执行路径建立讉K��模型。它同样�q�允许在单个工作内存中存在多个�ƈ发工作流�Q��ƈ�Ҏ��控制典型的业务处理过�E�的需求，从根本上�l�织规则的执行�?5.多应用支撑：对于有状态和无状态处理过�E�增强的支持以及全面的线�E�安全性，辅助Drools更轻易的嵌入在Java�q�_��Q�JavaEE以及面向服务的商业应用之中�?
6.直接可和Hibernate集成�Q�用户可以直接在Hibernate驱动的RDBMS查询中对数据�Q�facts�Q�进行判断。现有的Hibernate�l��g可以直接用在规则引擎里，减少�~�码的工作量�?
7.为非�E�序员设计的BRMS�Q�从技术角度来看，新的BRMS��Z��Web开发，使用AJAX呈现�Q�便于协作，是一个编写、版本化控制和管理规则的�pȝ��。业务分析师目前可以交互式的授权或修改自动�{换的规则。管理员目前具备完全的生命周期控制能力，包含何种规则在QA阶段�Q�分�D�（staging�Q�，以及实施�Q�production�Q�阶�D늭��{��?

3.Drools的��M��架构�Q?/span>
我们使用Drools��是��Z��让它处理数据与规则的关系�Q�因此Drools要获得数据和获得规则�Q�然后进行执行。因此Drools分�ؓ�~�制和运行时两个部分�?
�~�制是指产生rule的过�E�，Drools用DRL�Q�或者XML来描�q�规则。编制的�q�程包括��则徏立DRL 或XML 文�g�Q�传入一个由Antlr 3 文法器定义的解析器中。解析器�Ҏ��件中规则文法的正��性进行检查�ƈ为descr 建立一个中间结构，在AST 中的descr 代表规则的描�q�。AST 然后��descr 传入Package Builder中，由其�q�行打包。Package Builder 同时负责包括打包中用到的所有代码��生器和编译器。Package 对象是自包含�q�可配置的，它是一个包含规则的序列化的对象�?

RuleBase 是运行时�l��g�Q�包含一个或多个Package。Package 在�Q何时候都可以向RuleBase中添加或删除。一个RuleBase 可以同时初始化多个Working Memory�Q�在光��l�护着一个弱引用�Q�除非重新进行配�|�。Working Memory 包含许多子组�Ӟ��如Working Memory Event Support(事�g支持),Truth Maintenance System(真值维护系�l?, Agenda �?Agenda Event Support(事�g支持)。向Working Memory 中设�|�对象的工作可能要在建立了一个或多个�Ȁ�zȝ��规则后才�l�束。Agenda 负有规划�Ȁ�z�规则运行的责�Q�?

4.Drools主要有以下类实现�Q?/span>
�~�制�Q?
XmlParser,DrlParser 分别用来解析XML描述的规则文件和DRL描述的规则文件�?
PackageBuilder 创徏package实例�?
例如�Q?
PackageBuilder builder = new PackageBuilder();
builder.addPackageFromDrl( new InputStreamReader( getClass().getResourceAsStream( "package1.drl" ) ) );
builder.addPackageFromXml( new
InputStreamReader( getClass().getResourceAsStream( "package2.xml" ) ) );
Package pkg = builder.getPackage();

�q�行时的�c�：
RuleBase 使用RuleBaseFactory 实例化，默认情况下返回一个ReteOO 的RuleBase。Package通过使用addPackage �Ҏ��按顺序加入。你可以指定��M��名称�I�间的Packages 或者同一名称的多个包加入RuleBase�?
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );

事实数据相关�c�：
WorkingMemory 保存�q�行时事实数据的地方�?
由ruleBase产生�Q�WorkingMemory wm= ruleBase.newStatefulSession();

加蝲事实数据�Q?
wm.insert(object );
insert�Ҏ��q�回一个FactHandle对象指向workingMemory中对象的引用。如果要对Object�q�行修改删除�{�操作都要通过FactHander对象来完成�?

在准备好Rule�Q�和Fact�?��可以调�?WorkingMemory对象�?fireAllRules�Q�）�Ҏ��执行规则引擎�?

Agenda上面提到�q�它负有规划�Ȁ�z�规则运行的责�Q�?
它运行过�E�分两个阶段�Q?
1�Q?WorkingMemory Actions �Q?assert 新的 facts �Q�修改存在的 facts �?retract facts 都是 WorkingMemory Actions 。通过在应用程序中调用 fireAllRules() �Ҏ��Q�会使引�?转换�?Agenda Evaluatioin 阶段�?
2�Q?Agenda Evaluation �Q�尝试选择一条规则进行激发（ fire �Q�。如果规则没有找到就退出，否则它就��试�Ȁ发这条规则，然后转换�?WorkingMemory Actions 阶段�Q�直�?Agenda中�ؓ�I��?nbsp;

断点 2010-03-10 21:43 发表评论