Drools报错:The Eclipse JDT Core jar is not in the classpath
这是由于drools-compiler.jar自带两套编译机制 默认使用的Eclipse JDT CORE
但是在某些环境下会报The Eclipse JDT Core jar is not in the classpath 比如weblogic环境下
解决方法是
将drools默认编译方式改为JANINO,
附上部分测试代码..
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.FileReader;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderConfiguration;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import org.springframework.stereotype.Service;
/**
* 调用规则引擎的内部serivce 接口实现
* @author wuxiaogang
*
*/
@Service
public class DroolsUtil{
private static final transient Logger log = Logger.getLogger(DroolsUtil.class);
/** 本地缓存-已编译的事件规则 */
private static Map<String,KnowledgeBase> knowledgeBaseMap=new HashMap<String,KnowledgeBase>();
private static final Properties props = new Properties();
static{
props.put("drools.dialect.java.compiler","JANINO");
props.put("drools.dialect.default","java");
props.put("drools.compiler.lnglevel","1.7");
}
public static void main(String[] args) throws Exception {
DroolsUtil drl=new DroolsUtil();
//读取文件
BufferedReader br=new BufferedReader(new FileReader("d:/d4.drl" ));
StringBuffer sb=new StringBuffer("");
String line=null;
while((line=br.readLine())!=null){
sb.append( line +"\n");
}
Map m=new HashMap();
m.put( "service", drl );
m.put( "obj", new Object() );//具体对象
m.put( "serviceHandler", false );
drl.touchDrlStr(sb.toString(),m);//以代码串形式加载
System.out.println("=============="+m.get( "serviceHandler" ));
}
/**
* 验证生成的规则文件是否正确
* @return
* @throws Exception
*/
private boolean isDrlYN(String drl_name){
try {
// 创建规则构建器
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
// 加载规则文件，并增加到构建器
kbuilder.add(ResourceFactory.newClassPathResource("config/drools/"+drl_name+".drl"),ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
// 编译规则过程中发现规则是否有错误
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
log.error(drl_name+".drl规则中存在错误，错误消息如下："+error);
}
return false;
}
} catch (Exception e) {
log.error(drl_name+".drl规则文件验证异常：",e);
return false;
}
return true;
}
/**
* 根据规则文件名称 加载编译规则文件.
* @return
* @throws Exception
*/
private static KnowledgeBase readKnowledgeBase(String drl_name) throws Exception {
KnowledgeBuilderConfiguration kbConfig = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props, (ClassLoader[]) null);
// 创建规则构建器
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(kbConfig);
// 加载规则文件，并增加到构建器
kbuilder.add(ResourceFactory.newClassPathResource("config/drools/"+drl_name+".drl"),ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
// 编译规则过程中发现规则是否有错误
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.out.println("规则中存在错误，错误消息如下：");
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
// 创建规则构建库
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
// 构建器加载的资源文件包放入构建库
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static boolean touchDrlFile(String drlFileName,Object ... objs) throws Exception {
try {
//--根据事件code加载规则--
KnowledgeBase kbase = knowledgeBaseMap.get(drlFileName);
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "info");
if(objs!=null){
for(Object obj:objs){
ksession.insert(obj);
}
}
ksession.fireAllRules();
logger.close();
} catch (Exception t) {
t.printStackTrace();
}
return false;
}
/**
* 根据规则文件名称 加载编译规则文件.
* @return
* @throws Exception
*/
private static KnowledgeBase readKnowledgeBaseByStr(String drlcontext) throws Exception {
KnowledgeBuilderConfiguration kbConfig = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(props, (ClassLoader[]) null);
// 创建规则构建器
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(kbConfig);
// 加载规则文件，并增加到构建器
kbuilder.add(ResourceFactory.newInputStreamResource(new ByteArrayInputStream( drlcontext.getBytes() )),ResourceType.DRL);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
// 编译规则过程中发现规则是否有错误
if (errors.size() > 0) {
for (KnowledgeBuilderError error : errors) {
System.out.println("规则中存在错误，错误消息如下：");
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
// 创建规则构建库
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
// 构建器加载的资源文件包放入构建库
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static void touchDrlStr(String drlContextStr, Object... objs) throws Exception {
try {
log.info("-- start run script---------");
log.info(drlContextStr);
if(drlContextStr==null || drlContextStr.trim().length()==0){
return;
}
//--根据事件code加载规则--
KnowledgeBase kbase =readKnowledgeBaseByStr( drlContextStr );
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "info");
if(objs!=null){
for(Object obj:objs){
ksession.insert(obj);
}
}
ksession.fireAllRules();
logger.close();
log.info("-- end run script ----");
} catch (Exception t) {
log.error(".............run script exception.......",t);
}
}
}
附件中文件是代码文件和支持jar.
