Drools 不支持 Java 7（“RuntimeDroolsException: value '1.7' is not a valid language level”）
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No support for Java 7 in Drools ("RuntimeDroolsException: value '1.7' is not a valid language level")
提问by Bala
While I'm moving my project to java7, Drools starting throwing RuntimeDroolsException exception during init process. When i dig further, I found that this is happening when it validates java dialect.
当我将我的项目移动到 java7 时，Drools 在初始化过程中开始抛出 RuntimeDroolsException 异常。当我进一步挖掘时，我发现当它验证 java 方言时会发生这种情况。
The problem is: Drools 5.1.1 compares "java.version" system property with LANGUAGE_LEVELS to validate it. LANGUAGE_LEVELS is hard-coded list of java versions till 1.6
问题是：Drools 5.1.1 将“java.version”系统属性与 LANGUAGE_LEVELS 进行比较以验证它。LANGUAGE_LEVELS 是 Java 版本的硬编码列表，直到 1.6
In org.drools.rule.builder.dialect.java.JavaDialectConfiguration,
public static final String[] LANGUAGE_LEVELS = new String[]{"1.5", "1.6"};
I didn't want to change the source code. So I added the below as a workaround to bypass java dialect validation.
我不想更改源代码。所以我添加了以下作为绕过java方言验证的解决方法。
Properties properties = new Properties();
properties.setProperty( "drools.dialect.java.compiler.lnglevel","1.6" );
PackageBuilderConfiguration cfg =
new PackageBuilderConfiguration( properties );
KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(cfg);
Is there any better way of doing this other than editing source code?
除了编辑源代码之外，还有什么更好的方法可以做到这一点？
P.S: Drools 5.1.1 is the latest production version of the drools
PS：Drools 5.1.1是drools的最新生产版本
采纳答案by Bala
This is fixed in 5.2.1.FINAL version
这在 5.2.1.FINAL 版本中已修复
回答by CHristian Bonami
When you still want to use Drools 5.1.1(switching to a higher version is not always easy because rules do not compile anymore), this might be another, non-programmatic workaround.
当您仍想使用时Drools 5.1.1（切换到更高版本并不总是那么容易，因为规则不再编译），这可能是另一种非程序化的解决方法。
In META-INF/drools.packagebuilder.confyou can add these properties:
在META-INF/drools.packagebuilder.conf您可以添加这些属性：
drools.dialect.java.compiler = ECLIPSE
drools.dialect.java.lngLevel = 1.6
drools.dialect.java.compiler.lnglevel = 1.6
回答by ellisbjohns
I solved the above problem by replacing my referenced drools-complier.jar with the 5.4.0.Final version. I tried earlier releases of this jar but the same error resulted. This updated jar can be downloaded from the drools maven repo
我通过用 5.4.0.Final 版本替换我引用的 drools-complier.jar 解决了上述问题。我尝试了这个 jar 的早期版本，但结果是同样的错误。这个更新的 jar 可以从drools maven repo下载
回答by Manfred Moser
The best way would be submitting a patch to the project itself and helping them support Java 7 as well and then upgrading to that version once it is available.
最好的方法是向项目本身提交补丁并帮助他们支持 Java 7，然后在该版本可用后升级到该版本。
