8210094: Better loading of classloader classes
Reviewed-by: acorn, hseigel, ahgross, rhalade
--- a/src/hotspot/share/classfile/classFileParser.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/classFileParser.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -4484,33 +4484,6 @@
}
}
-// Attach super classes and interface classes to class loader data
-static void record_defined_class_dependencies(const InstanceKlass* defined_klass,
- TRAPS) {
- assert(defined_klass != NULL, "invariant");
-
- ClassLoaderData* const defining_loader_data = defined_klass->class_loader_data();
- if (defining_loader_data->is_the_null_class_loader_data()) {
- // Dependencies to null class loader data are implicit.
- return;
- } else {
- // add super class dependency
- Klass* const super = defined_klass->super();
- if (super != NULL) {
- defining_loader_data->record_dependency(super);
- }
-
- // add super interface dependencies
- const Array<InstanceKlass*>* const local_interfaces = defined_klass->local_interfaces();
- if (local_interfaces != NULL) {
- const int length = local_interfaces->length();
- for (int i = 0; i < length; i++) {
- defining_loader_data->record_dependency(local_interfaces->at(i));
- }
- }
- }
-}
-
// utility methods for appending an array with check for duplicates
static void append_interfaces(GrowableArray<InstanceKlass*>* result,
@@ -5717,9 +5690,6 @@
}
}
- // Update the loader_data graph.
- record_defined_class_dependencies(ik, CHECK);
-
ClassLoadingService::notify_class_loaded(ik, false /* not shared class */);
if (!is_internal()) {
--- a/src/hotspot/share/classfile/classLoaderDataGraph.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/classLoaderDataGraph.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -561,11 +561,6 @@
ClassLoaderData* data = _head;
while (data != NULL) {
- // Remove entries in the dictionary of live class loader that have
- // initiated loading classes in a dead class loader.
- if (data->dictionary() != NULL) {
- data->dictionary()->do_unloading();
- }
// Walk a ModuleEntry's reads, and a PackageEntry's exports
// lists to determine if there are modules on those lists that are now
// dead and should be removed. A module's life cycle is equivalent
--- a/src/hotspot/share/classfile/dictionary.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/dictionary.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -233,40 +233,6 @@
}
}
-
-void Dictionary::do_unloading() {
- assert_locked_or_safepoint(SystemDictionary_lock);
-
- // The NULL class loader doesn't initiate loading classes from other class loaders
- if (loader_data() == ClassLoaderData::the_null_class_loader_data()) {
- return;
- }
-
- // Remove unloaded entries and classes from this dictionary
- DictionaryEntry* probe = NULL;
- for (int index = 0; index < table_size(); index++) {
- for (DictionaryEntry** p = bucket_addr(index); *p != NULL; ) {
- probe = *p;
- InstanceKlass* ik = probe->instance_klass();
- ClassLoaderData* k_def_class_loader_data = ik->class_loader_data();
-
- // If the klass that this loader initiated is dead,
- // (determined by checking the defining class loader)
- // remove this entry.
- if (k_def_class_loader_data->is_unloading()) {
- assert(k_def_class_loader_data != loader_data(),
- "cannot have live defining loader and unreachable klass");
- *p = probe->next();
- free_entry(probe);
- continue;
- }
- // Clean pd_set
- clean_cached_protection_domains(probe);
- p = probe->next_addr();
- }
- }
-}
-
// Just the classes from defining class loaders
void Dictionary::classes_do(void f(InstanceKlass*)) {
for (int index = 0; index < table_size(); index++) {
--- a/src/hotspot/share/classfile/dictionary.hpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/dictionary.hpp Mon Sep 10 16:49:01 2018 -0400
@@ -74,9 +74,6 @@
void unlink();
- // Unload classes whose defining loaders are unloaded
- void do_unloading();
-
// Protection domains
InstanceKlass* find(unsigned int hash, Symbol* name, Handle protection_domain);
bool is_valid_protection_domain(unsigned int hash,
--- a/src/hotspot/share/classfile/systemDictionary.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/systemDictionary.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -861,8 +861,15 @@
check_constraints(d_hash, k, class_loader, false, THREAD);
// Need to check for a PENDING_EXCEPTION again; check_constraints
- // can throw and doesn't use the CHECK macro.
+ // can throw but we may have to remove entry from the placeholder table below.
if (!HAS_PENDING_EXCEPTION) {
+ // Record dependency for non-parent delegation.
+ // This recording keeps the defining class loader of the klass (k) found
+ // from being unloaded while the initiating class loader is loaded
+ // even if the reference to the defining class loader is dropped
+ // before references to the initiating class loader.
+ loader_data->record_dependency(k);
+
{ // Grabbing the Compile_lock prevents systemDictionary updates
// during compilations.
MutexLocker mu(Compile_lock, THREAD);
@@ -2177,6 +2184,7 @@
InstanceKlass* sd_check = find_class(d_hash, name, dictionary);
if (sd_check == NULL) {
dictionary->add_klass(d_hash, name, k);
+
notice_modification();
}
#ifdef ASSERT
--- a/src/hotspot/share/classfile/verificationType.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/verificationType.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -50,7 +50,6 @@
Klass* this_class = SystemDictionary::resolve_or_fail(
name, Handle(THREAD, klass->class_loader()),
Handle(THREAD, klass->protection_domain()), true, CHECK_false);
- klass->class_loader_data()->record_dependency(this_class);
if (log_is_enabled(Debug, class, resolve)) {
Verifier::trace_class_resolution(this_class, klass);
}
@@ -68,7 +67,6 @@
Klass* from_class = SystemDictionary::resolve_or_fail(
from_name, Handle(THREAD, klass->class_loader()),
Handle(THREAD, klass->protection_domain()), true, CHECK_false);
- klass->class_loader_data()->record_dependency(from_class);
if (log_is_enabled(Debug, class, resolve)) {
Verifier::trace_class_resolution(from_class, klass);
}
--- a/src/hotspot/share/classfile/verifier.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/classfile/verifier.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -2015,7 +2015,6 @@
true, THREAD);
if (kls != NULL) {
- current_class()->class_loader_data()->record_dependency(kls);
if (log_is_enabled(Debug, class, resolve)) {
Verifier::trace_class_resolution(kls, current_class());
}
--- a/src/hotspot/share/oops/constantPool.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/oops/constantPool.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -504,10 +504,6 @@
}
}
- // Make this class loader depend upon the class loader owning the class reference
- ClassLoaderData* this_key = this_cp->pool_holder()->class_loader_data();
- this_key->record_dependency(k);
-
// logging for class+resolve.
if (log_is_enabled(Debug, class, resolve)){
trace_class_resolution(this_cp, k);
--- a/src/hotspot/share/prims/jvm.cpp Tue Aug 28 13:22:57 2018 +0530
+++ b/src/hotspot/share/prims/jvm.cpp Mon Sep 10 16:49:01 2018 -0400
@@ -872,7 +872,6 @@
if (result != NULL) {
oop mirror = JNIHandles::resolve_non_null(result);
Klass* to_class = java_lang_Class::as_Klass(mirror);
- ClassLoaderData::class_loader_data(h_loader())->record_dependency(to_class);
}
if (log_is_enabled(Debug, class, resolve) && result != NULL) {
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/ClassUnload/ConstantPoolDependsTest.java Mon Sep 10 16:49:01 2018 -0400
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test ConstantPoolDependsTest
+ * @bug 8210094
+ * @summary Create ClassLoader dependency from initiating loader to class loader through constant pool reference
+ * @modules java.base/jdk.internal.misc
+ * java.compiler
+ * @library /runtime/testlibrary /test/lib
+ * @build sun.hotspot.WhiteBox
+ * @compile p2/c2.java MyDiffClassLoader.java
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+PrintSystemDictionaryAtExit -Xlog:class+unload=trace -XX:+WhiteBoxAPI ConstantPoolDependsTest
+ */
+
+import sun.hotspot.WhiteBox;
+
+
+public class ConstantPoolDependsTest {
+ public static WhiteBox wb = WhiteBox.getWhiteBox();
+ public static final String MY_TEST = "ConstantPoolDependsTest$c1c";
+
+ public static class c1c {
+ private void test() throws Exception {
+ // ConstantPool.klass_at_impl loads through constant pool and creates dependency
+ p2.c2 c2_obj = new p2.c2();
+ c2_obj.method2();
+ }
+
+ public c1c () throws Exception {
+ test();
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ test();
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ }
+ }
+
+ static void test() throws Throwable {
+
+ // now use the same loader to load class MyTest
+ Class MyTest_class = new MyDiffClassLoader(MY_TEST).loadClass(MY_TEST);
+
+ try {
+ // Call MyTest to load p2.c2 twice and call p2.c2.method2
+ MyTest_class.newInstance();
+ } catch (Exception e) {
+ throw new RuntimeException("Test FAILED if NoSuchMethodException is thrown");
+ }
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ ClassUnloadCommon.failIf(!wb.isClassAlive(MY_TEST), "should not be unloaded");
+ ClassUnloadCommon.failIf(!wb.isClassAlive("p2.c2"), "should not be unloaded");
+ // Unless MyTest_class is referenced here, the compiler can unload it.
+ System.out.println("Should not unload anything before here because " + MyTest_class + " is still alive.");
+ }
+
+ public static void main(String args[]) throws Throwable {
+ test();
+ ClassUnloadCommon.triggerUnloading(); // should unload
+ System.gc();
+ System.out.println("Should unload p2.c2 just now");
+ ClassUnloadCommon.failIf(wb.isClassAlive(MY_TEST), "should be unloaded");
+ ClassUnloadCommon.failIf(wb.isClassAlive("p2.c2"), "should be unloaded");
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/ClassUnload/DictionaryDependsTest.java Mon Sep 10 16:49:01 2018 -0400
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test DictionaryDependsTest
+ * @bug 8210094
+ * @summary Create ClassLoader dependency from initiating loader to class loader through reflection
+ * @modules java.base/jdk.internal.misc
+ * java.compiler
+ * @library /runtime/testlibrary /test/lib
+ * @build sun.hotspot.WhiteBox
+ * @compile p2/c2.java MyDiffClassLoader.java
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -Xlog:class+unload=trace -XX:+WhiteBoxAPI DictionaryDependsTest
+ */
+import sun.hotspot.WhiteBox;
+import java.lang.reflect.Method;
+
+public class DictionaryDependsTest {
+ public static WhiteBox wb = WhiteBox.getWhiteBox();
+ public static final String MY_TEST = "DictionaryDependsTest$c1r";
+
+ static public class c1r {
+
+ private void test() throws Exception {
+ // forName loads through reflection and doesn't create dependency
+ Class<?> x = Class.forName("p2.c2", true, c1r.class.getClassLoader());
+ Method m = x.getMethod("method2");
+ java.lang.Object t = x.newInstance();
+ m.invoke(t);
+ }
+
+ public c1r () throws Exception {
+ test();
+ ClassUnloadCommon.triggerUnloading(); // should unload p2.c2
+ test();
+ ClassUnloadCommon.triggerUnloading(); // should unload p2.c2
+ }
+ }
+
+ public void test() throws Throwable {
+
+ // now use the same loader to load class MyTest
+ Class MyTest_class = new MyDiffClassLoader(MY_TEST).loadClass(MY_TEST);
+
+ try {
+ // Call MyTest to load p2.c2 twice and call p2.c2.method2
+ MyTest_class.newInstance();
+ } catch (Exception e) {
+ System.out.println("Not expected NSME");
+ throw new RuntimeException("Not expecting NSME");
+ }
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ ClassUnloadCommon.failIf(!wb.isClassAlive(MY_TEST), "should not be unloaded");
+ ClassUnloadCommon.failIf(!wb.isClassAlive("p2.c2"), "should not be unloaded");
+ // Unless MyTest_class is referenced here, the compiler can unload it.
+ System.out.println("Should not unload anything before here because " + MyTest_class + " is still alive.");
+ }
+
+ public static void main(String args[]) throws Throwable {
+ DictionaryDependsTest d = new DictionaryDependsTest();
+ d.test();
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ System.out.println("Should unload MyTest and p2.c2 just now");
+ ClassUnloadCommon.failIf(wb.isClassAlive(MY_TEST), "should be unloaded");
+ ClassUnloadCommon.failIf(wb.isClassAlive("p2.c2"), "should be unloaded");
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/ClassUnload/MyDiffClassLoader.java Mon Sep 10 16:49:01 2018 -0400
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.io.*;
+import jdk.test.lib.compiler.InMemoryJavaCompiler;
+
+public class MyDiffClassLoader extends ClassLoader {
+
+ public String loaderName;
+ public static boolean switchClassData = false;
+
+ MyDiffClassLoader(String name) {
+ this.loaderName = name;
+ }
+
+ public Class loadClass(String name) throws ClassNotFoundException {
+ if (!name.contains("c1r") &&
+ !name.contains("c1c") &&
+ !name.contains("c1s") &&
+ !name.equals("p2.c2")) {
+ return super.loadClass(name);
+ }
+
+ // new loader loads p2.c2
+ if (name.equals("p2.c2") && !loaderName.equals("C2Loader")) {
+ Class<?> c = new MyDiffClassLoader("C2Loader").loadClass(name);
+ switchClassData = true;
+ return c;
+ }
+
+ byte[] data = switchClassData ? getNewClassData(name) : getClassData(name);
+ System.out.println("name is " + name);
+ return defineClass(name, data, 0, data.length);
+ }
+ byte[] getClassData(String name) {
+ try {
+ String TempName = name.replaceAll("\\.", "/");
+ String currentDir = System.getProperty("test.classes");
+ String filename = currentDir + File.separator + TempName + ".class";
+ FileInputStream fis = new FileInputStream(filename);
+ byte[] b = new byte[5000];
+ int cnt = fis.read(b, 0, 5000);
+ byte[] c = new byte[cnt];
+ for (int i=0; i<cnt; i++) c[i] = b[i];
+ return c;
+ } catch (IOException e) {
+ return null;
+ }
+ }
+
+ // Return p2.c2 with everything removed
+ byte[] getNewClassData(String name) {
+ return InMemoryJavaCompiler.compile("p2.c2", "package p2; public class c2 { }");
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/ClassUnload/SuperDependsTest.java Mon Sep 10 16:49:01 2018 -0400
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test SuperDependsTest
+ * @bug 8210094
+ * @summary Create ClassLoader dependency from initiating loader to class loader through subclassing
+ * @library /test/lib
+ * @modules java.base/jdk.internal.misc
+ * java.compiler
+ * @library /runtime/testlibrary /test/lib
+ * @build sun.hotspot.WhiteBox
+ * @compile p2/c2.java MyDiffClassLoader.java
+ * @run main ClassFileInstaller sun.hotspot.WhiteBox
+ * sun.hotspot.WhiteBox$WhiteBoxPermission
+ * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+PrintSystemDictionaryAtExit -Xlog:class+unload=trace -XX:+WhiteBoxAPI SuperDependsTest
+ */
+import sun.hotspot.WhiteBox;
+import p2.*;
+
+public class SuperDependsTest {
+ public static WhiteBox wb = WhiteBox.getWhiteBox();
+ public static final String MY_TEST = "SuperDependsTest$c1s";
+
+
+ // p2.c2 loads through super class and creates dependency
+ public static class c1s extends p2.c2 {
+
+ private void test() throws Exception {
+ method2();
+ }
+
+ public c1s () throws Exception {
+ test();
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ test();
+ }
+ }
+
+ public void test() throws Throwable {
+
+ // now use the same loader to load class MyTest
+ Class MyTest_class = new MyDiffClassLoader(MY_TEST).loadClass(MY_TEST);
+
+ // Call MyTest to load p2.c2 twice and call p2.c2.method2
+ MyTest_class.newInstance();
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ ClassUnloadCommon.failIf(!wb.isClassAlive(MY_TEST), "should not be unloaded");
+ ClassUnloadCommon.failIf(!wb.isClassAlive("p2.c2"), "should not be unloaded");
+ // Unless MyTest_class is referenced here, the compiler can unload it.
+ System.out.println("Should not unload anything before here because " + MyTest_class + " is still alive.");
+ }
+
+ public static void main(String args[]) throws Throwable {
+ SuperDependsTest d = new SuperDependsTest();
+ d.test();
+ ClassUnloadCommon.triggerUnloading(); // should not unload anything
+ System.out.println("Should unload MyTest and p2.c2 just now");
+ ClassUnloadCommon.failIf(wb.isClassAlive(MY_TEST), "should be unloaded");
+ ClassUnloadCommon.failIf(wb.isClassAlive("p2.c2"), "should be unloaded");
+ }
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/ClassUnload/p2/c2.java Mon Sep 10 16:49:01 2018 -0400
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package p2;
+
+public class c2 {
+ int i;
+ public void method2() { i = 5; System.out.println("c2 method2 called"); }
+}