[#513] fix ReflectExtensions.invoke for static methods

Signed-off-by: Christian Dietrich <[email protected]>

org.eclipse.xtext.xbase.lib.tests/src/org/eclipse/xtext/xbase/tests/lib/util/ReflectExtensionsTest.java

@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2018, 2022 itemis AG (http://www.itemis.eu) and others.
+ * Copyright (c) 2018, 2023 itemis AG (http://www.itemis.eu) and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -8,6 +8,8 @@
  *******************************************************************************/
 package org.eclipse.xtext.xbase.tests.lib.util;
 
+import static org.junit.Assert.*;
+
 import org.eclipse.xtext.xbase.lib.Functions.Function1;
 import org.eclipse.xtext.xbase.lib.util.ReflectExtensions;
 import org.junit.Assert;
@@ -57,7 +59,41 @@ public void testInvokeWithPrimitives() throws Exception {
 		String x = "foo";
 		Assert.assertEquals("o", ext.invoke(x, "substring", 1, 2));
 	}
+
 
+	@Test
+	public void testInvokeWithStaticMethod() throws Exception {
+		String x = "foo";
+		ext.invoke(x, "join", "a", new String[]{"b", "c"});
+	}
+
+	@Test
+	public void testInvokeWithPrivateStaticMethod() throws Exception {
+		MyClass x = new MyClass();
+		ext.invoke(x, "doit");
+	}
+
+	@Test
+	public void testSetWithPrivateStaticField() throws Exception {
+		MyClass x = new MyClass();
+		ext.set(x, "x","doit");
+	}
+
+	@Test
+	public void testGetWithPrivateStaticField() throws Exception {
+		MyClass x = new MyClass();
+		assertEquals("old", ext.get(x, "x"));
+	}
+
+	public static class MyClass {
+		@SuppressWarnings("unused")
+		private static String doit() {
+			return "doit";
+		}
+		@SuppressWarnings("unused")
+		private String x = "old";
+	}
+
 	@Test
 	public void testGet_01() throws Exception {
 		ReflectExtensionsTest x = new ReflectExtensionsTest();
@@ -96,4 +132,5 @@ public void testSet_03() throws Exception {
 		Assert.assertNull(x.privateExt);
 	}
 
+
 }

org.eclipse.xtext.xbase.lib/src/org/eclipse/xtext/xbase/lib/util/ReflectExtensions.java

@@ -11,6 +11,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
 
 import com.google.common.annotations.Beta;
 import com.google.common.base.Preconditions;
@@ -119,8 +120,15 @@ public Object invoke(Object receiver, String methodName, /* @Nullable */ Object.
 			}
 		} while(compatible == null && (clazz = clazz.getSuperclass()) != null);
 		if (compatible != null) {
-			if (!compatible.canAccess(receiver))
-				compatible.setAccessible(true);
+			boolean isStatic = Modifier.isStatic(compatible.getModifiers());
+			if (isStatic) {
+				if (!compatible.canAccess(null))
+					compatible.setAccessible(true);
+			}
+			else {
+				if (!compatible.canAccess(receiver))
+					compatible.setAccessible(true);
+			}
 			return compatible.invoke(receiver, arguments);
 		}
 		// not found provoke method not found exception