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我無法將字段添加到新類型聲明中。我是否需要一個實際的Java類來處理.drl文件中的每個類型聲明？我以爲那些是由Drools生成的？Drools：無法在.drl文件中聲明新類型（包含字段）
這工作：
package tests
declare Person
end
現在添加一個字段（類型無所謂）：
package tests
declare Person
age : int
end
而且它拋出下面的錯誤。
java.lang.NoSuchMethodError: java.lang.String.isEmpty()Z
at org.drools.compiler.PackageBuilder.resolveType(PackageBuilder.java:1606)
at org.drools.compiler.PackageBuilder.fillFieldTypes(PackageBuilder.java:1672)
at org.drools.compiler.PackageBuilder.processTypeDeclarations(PackageBuilder.java:2008)
at org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:1272)
at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:869)
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:466)
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:694)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:51)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:40)
at RuleTest.setUp(RuleTest.java:35)
at junit.framework.TestCase.runBare(TestCase.java:132)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:232)
at junit.framework.TestSuite.run(TestSuite.java:227)
at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
它在 「Testrules.drl」 行拋出：
@Override
public void setUp() throws Exception {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Testrules.drl"), ResourceType.DRL);
...
}
使用 的Eclipse 3.4.2， 的Drools 5.5.0最終