Grails: How to reference Service itself and use it in Java? - grails

Question

A SomeService is defined and in a closure it is passed to a Java class:
package somepackage
class SomeService{
...
def process(){
...
//here, how to reference [thisService]? this keyword?
//I tried this keyword, but an exception occurs
JavaClass javaObject = new JavaClass(thisService, otherParams)
...
}
...
}
Exception is thrown when using this referring to SomeService:
Groovyc: java.lang.NoClassDefFoundError: somepackage/SomeService
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethods(Class.java:1791)
at org.codehaus.groovy.vmplugin.v5.Java5.configureClassNode(Java5.java:318)
at org.codehaus.groovy.ast.ClassNode.lazyClassInit(ClassNode.java:263)
at org.codehaus.groovy.ast.ClassNode.getUnresolvedSuperClass(ClassNode.java:957)
at org.codehaus.groovy.ast.ClassNode.getUnresolvedSuperClass(ClassNode.java:952)
at org.codehaus.groovy.ast.ClassNode.getSuperClass(ClassNode.java:946)
at org.codehaus.groovy.ast.ClassNode.isDerivedFrom(ClassNode.java:889)
at org.codehaus.groovy.classgen.AsmClassGenerator.assignmentCastAndVisit(AsmClassGenerator.java:4049)
at org.codehaus.groovy.classgen.AsmClassGenerator.evaluateEqual(AsmClassGenerator.java:4002)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitDeclarationExpression(AsmClassGenerator.java:1468)
at org.codehaus.groovy.ast.expr.DeclarationExpression.visit(DeclarationExpression.java:53)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitAndAutoboxBoolean(AsmClassGenerator.java:4111)
at org.codehaus.groovy.classgen.AsmClassGenerator.evaluateExpression(AsmClassGenerator.java:1437)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitReturnStatement(AsmClassGenerator.java:1398)
at org.codehaus.groovy.ast.stmt.ReturnStatement.visit(ReturnStatement.java:47)
at org.codehaus.groovy.ast.CodeVisitorSupport.visitBlockStatement(CodeVisitorSupport.java:35)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitBlockStatement(ClassCodeVisitorSupport.java:165)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:728)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:69)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:101)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:112)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitStdMethod(AsmClassGenerator.java:616)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:591)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:123)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethod(AsmClassGenerator.java:686)
at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1039)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:50)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:276)
at org.codehaus.groovy.control.CompilationUnit$12.call(CompilationUnit.java:748)
at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:942)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:519)
at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:497)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:474)
at org.jetbrains.groovy.compiler.rt.GroovyCompilerWrapper.compile(GroovyCompilerWrapper.java:54)
at org.jetbrains.groovy.compiler.rt.DependentGroovycRunner.runGroovyc(DependentGroovycRunner.java:80)
at org.jetbrains.groovy.compiler.rt.GroovycRunner.main(GroovycRunner.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.intellij.rt.execution.CommandLineWrapper.main(CommandLineWrapper.java:121)
Caused by: java.lang.ClassNotFoundException: entrust.EnTrustService
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 43 more
My question is: how to reference the service itself to other classes? if this is applicable, is this problem related to the calling class being Java class other than groovy class?

Answer 1

You can get a reference to someService bean from ApplicationContext as:
class SomeService{
def grailsApplication
def process(){
...
//here, how to reference [thisService]? this keyword?
//I tried this keyword, but an exception occurs
JavaClass javaObject =
new JavaClass(grailsApplication.mainContext.someService, otherParams)
...
}
}
Doing this, the control goes out of the proxy and fetches the bean from the context. This same principle is applied in transactions or any aspects (AOP) related transition from one method to other in the same service class. Here is an example.