如何解决Drools 无法从静态函数返回地图
我正在尝试从在 drools 中调用的 java 静态函数返回一个映射。
我在java中的静态函数是这样的
public static Map getMyMap() {
HashMap h = new HashMap();
h.put(1,2);
h.put(2,4);
return h;
}
当我尝试在流口水中导入它时
import function com.mypackage.utils.CommonUtils.getMyMap;
我得到如下异常，不清楚
Exception in thread "main" java.lang.RuntimeException: wrong class format
at org.drools.compiler.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:279)
at org.drools.compiler.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:219)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:113)
at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.resolve(UnresolvedReferenceBinding.java:49)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:122)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFromTypeSignature(LookupEnvironment.java:1335)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFromVariantTypeSignature(LookupEnvironment.java:1391)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeArgumentsFromSignature(LookupEnvironment.java:1172)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFromTypeSignature(LookupEnvironment.java:1340)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.createMethod(BinaryTypeBinding.java:550)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.createMethods(BinaryTypeBinding.java:630)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.cachePartsFrom(BinaryTypeBinding.java:365)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createBinaryTypeFrom(LookupEnvironment.java:688)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createBinaryTypeFrom(LookupEnvironment.java:667)
at org.eclipse.jdt.internal.compiler.Compiler.accept(Compiler.java:296)
at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:118)
at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.resolve(UnresolvedReferenceBinding.java:49)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:122)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveTypesFor(BinaryTypeBinding.java:1094)
at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.getmethods(BinaryTypeBinding.java:919)
at org.eclipse.jdt.internal.compiler.lookup.compilationunitScope.findStaticmethod(compilationunitScope.java:588)
at org.eclipse.jdt.internal.compiler.lookup.compilationunitScope.findSingleStaticImport(compilationunitScope.java:566)
at org.eclipse.jdt.internal.compiler.lookup.compilationunitScope.findSingleImport(compilationunitScope.java:540)
at org.eclipse.jdt.internal.compiler.lookup.compilationunitScope.faultinimports(compilationunitScope.java:369)
at org.eclipse.jdt.internal.compiler.lookup.compilationunitScope.faultInTypes(compilationunitScope.java:466)
at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:756)
at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:468)
at org.drools.compiler.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:405)
at org.drools.compiler.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
at org.drools.compiler.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:405)
at org.drools.compiler.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:46)
at org.drools.compiler.compiler.PackageRegistry.compileAll(PackageRegistry.java:110)
at org.drools.compiler.compiler.PackageBuilder.compileAll(PackageBuilder.java:1334)
at org.drools.compiler.compiler.PackageBuilder.compileRules(PackageBuilder.java:1058)
at org.drools.compiler.compiler.PackageBuilder.compileAllRules(PackageBuilder.java:972)
at org.drools.compiler.compiler.PackageBuilder.addPackage(PackageBuilder.java:964)
at org.drools.compiler.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:455)
at org.drools.compiler.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:431)
at com.mypackage.main.DroolsTest.sslRule(DroolsTest.java:58)
at com.mypackage.main.DroolsTest.executeDrools(DroolsTest.java:112)
at com.mypackage.main.DroolsTest.main(DroolsTest.java:24)
Caused by: org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException
at org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader.<init>(ClassFileReader.java:372)
at org.drools.compiler.commons.jci.compilers.EclipseJavaCompiler$2.createNameEnvironmentAnswer(EclipseJavaCompiler.java:303)
at org.drools.compiler.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:274)
... 40 more
我认为这可能是泛型的问题，所以我已将其删除。 如果我尝试将返回类型从 Map 更改为 List，函数将被导入而不会出现编译问题，我也可以使用它。
有人知道哪里出了问题吗？
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