无法运行“Hello World” Eclipse 中的 Drools 示例：运行时异常 org.drools.RuntimeDroolsException：无法加载方言

发布于 2024-09-10 21:07:33 字数 2542 浏览 9 评论 0原文

我刚刚在 Eclipse（版本 3.5.2）中安装了 Drools 插件，并且我正在尝试运行该插件附带的“Hello World”示例。

当我运行代码时，我收到运行时错误，并显示以下堆栈跟踪：

org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java:org.drools.rule.builder.dialect.java.JavaDialectConfiguration'
 at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)
 at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259)
 at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176)
 at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
 at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242)
 at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:142)
 at org.drools.builder.impl.KnowledgeBuilderProviderImpl.newKnowledgeBuilder(KnowledgeBuilderProviderImpl.java:29)
 at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:29)
 at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:39)
 at com.sample.DroolsTest.main(DroolsTest.java:23)
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:94)
 at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
 at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270)
 ... 9 more

以下是一些相关的 Java 代码：

public static final void main(String[] args) {
    try {
        // load up the knowledge base
        KnowledgeBase kbase = readKnowledgeBase();
    }
}

private static KnowledgeBase readKnowledgeBase() throws Exception {
    KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
    kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), ResourceType.DRL);
    KnowledgeBuilderErrors errors = kbuilder.getErrors();
    if (errors.size() > 0) {
        for (KnowledgeBuilderError error : errors) {
            System.err.println(error);
        }
        throw new IllegalArgumentException("Could not parse knowledge.");
    }
    KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
    kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
    return kbase;
}

原文

I just installed the Drools plug-in in Eclipse (version 3.5.2), and I am trying to run the "Hello World" example that comes with the plug-in.

When I run the code, I am getting runtime error with the following stack trace:

org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java:org.drools.rule.builder.dialect.java.JavaDialectConfiguration'
 at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:274)
 at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:259)
 at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:176)
 at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:153)
 at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:242)
 at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:142)
 at org.drools.builder.impl.KnowledgeBuilderProviderImpl.newKnowledgeBuilder(KnowledgeBuilderProviderImpl.java:29)
 at org.drools.builder.KnowledgeBuilderFactory.newKnowledgeBuilder(KnowledgeBuilderFactory.java:29)
 at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:39)
 at com.sample.DroolsTest.main(DroolsTest.java:23)
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:94)
 at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:55)
 at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:270)
 ... 9 more

Here is some of the relevant Java code:

public static final void main(String[] args) {
    try {
        // load up the knowledge base
        KnowledgeBase kbase = readKnowledgeBase();
    }
}

private static KnowledgeBase readKnowledgeBase() throws Exception {
    KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
    kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"), ResourceType.DRL);
    KnowledgeBuilderErrors errors = kbuilder.getErrors();
    if (errors.size() > 0) {
        for (KnowledgeBuilderError error : errors) {
            System.err.println(error);
        }
        throw new IllegalArgumentException("Could not parse knowledge.");
    }
    KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
    kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
    return kbase;
}

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夏见 2024-09-17 21:07:33

您的类路径中缺少 eclipse JDT core jar。如果您没有使用 Drools 类路径容器或者您手动创建了自己的运行时，请确保该 jar 是您的类路径或运行时目录的一部分。如果您使用 Drools 类路径容器并生成默认运行时，并且 JDT 核心 jar 不存在，请确保使用支持 Eclipse 3.5.2 的最新版本的插件。当然，您也可以手动添加 JDT 核心 jar 并重新创建运行时。

有关运行时的更多信息，请访问 http://download.jboss.org/drools/release/5.1.1.34858.FINAL/drools-5.1.1-docs.zip 并打开 drools-5.1.1-docs.zip\drools -flow\html\ch.Drools_Eclipse_IDE_Features.html

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我只土不豪 2024-09-17 21:07:33

如果您使用的是 JDK 1.7 或更高版本，则需要在创建 JVM 之前设置参数，因为 JNI4NET Sample 上使用的 Drools 是版本 5.1，它不适用于 JDK 1.7 或更高版本。

在创建 JVM 之前尝试使用此行：

var bridgeSetup = new BridgeSetup();
// ... 
bridgeSetup.AddJVMOption("-Ddrools.dialect.java.compiler.lnglevel", "1.6");
// ...
Bridge.CreateJVM(bridgeSetup);

If you are using a JDK 1.7 or over, you will have set a parameter before create JVM because Drools used on JNI4NET Sample is version 5.1 and it doesn't work on JDK 1.7 or over.

Try use this line before create JVM:

var bridgeSetup = new BridgeSetup();
// ... 
bridgeSetup.AddJVMOption("-Ddrools.dialect.java.compiler.lnglevel", "1.6");
// ...
Bridge.CreateJVM(bridgeSetup);

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草莓味的萝莉 2024-09-17 21:07:33

这是一个常见问题，只需在类路径中包含 eclipse Jdt core jar 即可解决此问题。
您可以从这里添加 jar：
http://www.java2s.com/Code/Jar/o/Downloadorgeclipsejdtcore371jar。嗯

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风柔一江水 2024-09-17 21:07:33

所以我终于重新开始了。

我执行了以下操作（2014 年 4 月）

从 Eclipse Kepler 的全新安装开始
转到 Eclipse Marketplace 并搜索“JBoss Developer Studio (Kepler)”，然后安装：“Red Hat JBoss Developer Studio (Kepler) 7.1.1.GA” （您的版本可能有所不同）
重新启动 Eclipse
转到 Eclipse Marketplace 并搜索“JBoss Developer Studio (Kepler)”，然后安装：“JBoss Tools (Kepler) 4.1.2.Final”（您的版本可能有所不同）
重新启动 Eclipse。
安装“流口水”。转到 Eclipse 菜单，然后选择“帮助”/“安装新软件”并添加以下 URL。
Drools_UpdateSite - http://download.jboss.org/ drools/release/6.0.0.Final/org.drools.updatesite/
我安装了每个选项。
重新启动 Eclipse。
转到 New-Project 并添加一个新的“Drools Project”。

然后我就可以运行流口水的“hello world”了。

我还添加了：

转到 Eclipse 菜单，然后“帮助”/“安装新软件”并添加以下 URL。

http://download.eclipse.org/technology/m2e/releases

并安装了

"m2e - Maven Integration for Eclipse"
and "m2e - slf4j over logback logging (Optional)"

So I finally started over.

I did the following (April, 2014)

Starting with clean install of Eclipse Kepler
Go to Eclipse Marketplace and search for "JBoss Developer Studio (Kepler)" and then install: "Red Hat JBoss Developer Studio (Kepler) 7.1.1.GA" (Your version may vary)
Restart Eclipse
Go to Eclipse Marketplace and search for "JBoss Developer Studio (Kepler)" and then install: "JBoss Tools (Kepler) 4.1.2.Final" (Your version may vary)
Restart Eclipse.
Install "drools". Go to Eclipse Menu and then "Help" / "Install New Software" and add the below URL.
Drools_UpdateSite - http://download.jboss.org/drools/release/6.0.0.Final/org.drools.updatesite/
I installed every option.
Restart Eclipse.
Go to New-Project and add a new "Drools Project".

Then I was able to run the drools "hello world".

I also added:

Go to Eclipse Menu and then "Help" / "Install New Software" and add the below URL.

http://download.eclipse.org/technology/m2e/releases

and installed

"m2e - Maven Integration for Eclipse"
and "m2e - slf4j over logback logging (Optional)"

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余厌 2024-09-17 21:07:33

我遇到了同样的问题。
正如其他答案中所述，如果运行时是手动创建的（如我的情况），那么您需要在类路径中添加 eclipse JDT core jar。
这是 jar 的下载链接-> http://www.java2s.com/Code/Jar/o/Downloadorgeclipsejdtcore371jar.htm
将其添加到类路径解决了我的问题。

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