Revert "Set Thread context classloder for entire middleware chain (#7…

src/main/java/com/microsoft/azure/functions/worker/broker/EnhancedJavaMethodExecutorImpl.java

@@ -0,0 +1,28 @@
+package com.microsoft.azure.functions.worker.broker;
+
+import com.microsoft.azure.functions.worker.binding.*;
+
+/**
+ * Used to executor of arbitrary Java method in any JAR using reflection.
+ * Thread-Safety: Multiple thread.
+ */
+public class EnhancedJavaMethodExecutorImpl implements JavaMethodExecutor {
+
+    private final ClassLoader classLoader;
+
+    public EnhancedJavaMethodExecutorImpl(ClassLoader classLoader) {
+        this.classLoader = classLoader;
+    }
+
+    public void execute(ExecutionContextDataSource executionContextDataSource) throws Exception {
+        try {
+            Thread.currentThread().setContextClassLoader(this.classLoader);
+            Object retValue = ParameterResolver.resolveArguments(executionContextDataSource)
+                    .orElseThrow(() -> new NoSuchMethodException("Cannot locate the method signature with the given input"))
+                    .invoke(executionContextDataSource::getFunctionInstance);
+            executionContextDataSource.updateReturnValue(retValue);
+        } finally {
+            Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
+        }
+    }
+}

src/main/java/com/microsoft/azure/functions/worker/broker/JavaFunctionBroker.java

@@ -113,29 +113,20 @@ private void initializeFunctionInstanceInjector() {
 	}
 
 	private FunctionExecutionMiddleware getFunctionExecutionMiddleWare() {
-		FunctionExecutionMiddleware functionExecutionMiddleware = new FunctionExecutionMiddleware(JavaMethodExecutor.getInstance());
+		FunctionExecutionMiddleware functionExecutionMiddleware = new FunctionExecutionMiddleware(
+				JavaMethodExecutors.createJavaMethodExecutor(this.classLoaderProvider.createClassLoader()));
 		WorkerLogManager.getSystemLogger().info("Load last middleware: FunctionExecutionMiddleware");
 		return functionExecutionMiddleware;
 	}
 
 	public Optional<TypedData> invokeMethod(String id, InvocationRequest request, List<ParameterBinding> outputs)
 			throws Exception {
 		ExecutionContextDataSource executionContextDataSource = buildExecutionContext(id, request);
-		invoke(executionContextDataSource);
+		this.invocationChainFactory.create().doNext(executionContextDataSource);
 		outputs.addAll(executionContextDataSource.getDataStore().getOutputParameterBindings(true));
 		return executionContextDataSource.getDataStore().getDataTargetTypedValue(BindingDataStore.RETURN_NAME);
 	}
 
-	private void invoke(ExecutionContextDataSource executionContextDataSource) throws Exception {
-		ClassLoader prevContextClassLoader = Thread.currentThread().getContextClassLoader();
-		try {
-			Thread.currentThread().setContextClassLoader(classLoaderProvider.createClassLoader());
-			this.invocationChainFactory.create().doNext(executionContextDataSource);
-		} finally {
-			Thread.currentThread().setContextClassLoader(prevContextClassLoader);
-		}
-	}
-
 	private ExecutionContextDataSource buildExecutionContext(String id,  InvocationRequest request)
 			throws NoSuchMethodException {
 		ImmutablePair<String, FunctionDefinition> methodEntry = this.methods.get(id);

src/main/java/com/microsoft/azure/functions/worker/broker/JavaMethodExecutor.java

@@ -1,25 +1,14 @@
 package com.microsoft.azure.functions.worker.broker;
 
+
+import java.util.*;
 import com.microsoft.azure.functions.worker.binding.*;
 
+
 /**
  * Used to executor of arbitrary Java method in any JAR using reflection.
  * Thread-Safety: Multiple thread.
  */
-public class JavaMethodExecutor {
-
-    private static final JavaMethodExecutor INSTANCE = new JavaMethodExecutor();
-
-    public static JavaMethodExecutor getInstance(){
-        return INSTANCE;
-    }
-
-    private JavaMethodExecutor() {}
-
-    public void execute(ExecutionContextDataSource executionContextDataSource) throws Exception {
-        Object retValue = ParameterResolver.resolveArguments(executionContextDataSource)
-                .orElseThrow(() -> new NoSuchMethodException("Cannot locate the method signature with the given input"))
-                .invoke(executionContextDataSource::getFunctionInstance);
-        executionContextDataSource.updateReturnValue(retValue);
-    }
+public interface JavaMethodExecutor {
+    void execute(ExecutionContextDataSource executionContextDataSource) throws Exception;
 }

src/main/java/com/microsoft/azure/functions/worker/broker/JavaMethodExecutorImpl.java

@@ -0,0 +1,25 @@
+package com.microsoft.azure.functions.worker.broker;
+
+import com.microsoft.azure.functions.worker.binding.*;
+
+/**
+ * Used to executor of arbitrary Java method in any JAR using reflection.
+ * Thread-Safety: Multiple thread.
+ */
+public class JavaMethodExecutorImpl implements JavaMethodExecutor {
+
+    private static final JavaMethodExecutorImpl INSTANCE = new JavaMethodExecutorImpl();
+
+    public static JavaMethodExecutorImpl getInstance(){
+        return INSTANCE;
+    }
+
+    private JavaMethodExecutorImpl () {}
+
+    public void execute(ExecutionContextDataSource executionContextDataSource) throws Exception {
+        Object retValue = ParameterResolver.resolveArguments(executionContextDataSource)
+                .orElseThrow(() -> new NoSuchMethodException("Cannot locate the method signature with the given input"))
+                .invoke(executionContextDataSource::getFunctionInstance);
+        executionContextDataSource.updateReturnValue(retValue);
+    }
+}

src/main/java/com/microsoft/azure/functions/worker/broker/JavaMethodExecutors.java

@@ -0,0 +1,16 @@
+package com.microsoft.azure.functions.worker.broker;
+
+import com.microsoft.azure.functions.worker.WorkerLogManager;
+import org.apache.commons.lang3.SystemUtils;
+
+public class JavaMethodExecutors {
+    public static JavaMethodExecutor createJavaMethodExecutor(ClassLoader classLoader) {
+        if(SystemUtils.IS_JAVA_1_8) {
+            WorkerLogManager.getSystemLogger().info("Loading JavaMethodExecutorImpl");
+            return JavaMethodExecutorImpl.getInstance();
+        } else {
+            WorkerLogManager.getSystemLogger().info("Loading EnhancedJavaMethodExecutorImpl");
+            return new EnhancedJavaMethodExecutorImpl(classLoader);
+        }
+    }
+}