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*
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* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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*/
/**
* @test
* @bug 4882798 5067523
* @summary insure redefine is supported. exercise a class, then redefine it and do it again
* @author Gabriel Adauto, Wily Technology
*
* @run build RedefineClassesTests
* @run shell RedefineSetUp.sh
* @run shell MakeJAR.sh redefineAgent
* @run main/othervm -javaagent:redefineAgent.jar RedefineClassesTests RedefineClassesTests
*/
import java.io.*;
import java.lang.instrument.*;
import java.lang.reflect.*;
public class
RedefineClassesTests
extends ASimpleInstrumentationTestCase
{
/**
* Constructor for RedefineClassesTests.
* @param name
*/
public RedefineClassesTests(String name)
{
super(name);
}
public static void
main (String[] args)
throws Throwable {
ATestCaseScaffold test = new RedefineClassesTests(args[0]);
test.runTest();
}
protected final void
doRunTest()
throws Throwable {
testIsRedefineClassesSupported();
testSimpleRedefineClasses();
testUnmodifiableClassException();
}
public void
testIsRedefineClassesSupported()
{
boolean canRedef = fInst.isRedefineClassesSupported();
assertTrue("Cannot redefine classes", canRedef);
}
public void
testSimpleRedefineClasses()
throws Throwable
{
// first load the class and prove that it is the right one
ExampleRedefine ex = new ExampleRedefine();
// with this version of the class, doSomething is a nop
int firstGet = ex.get();
ex.doSomething();
int secondGet = ex.get();
assertEquals(firstGet, secondGet);
// now redefine the class. This will change doSomething to be an increment
// this class is stored in a different place (scratch directory) to avoid collisions
File f = new File("Different_ExampleRedefine.class");
System.out.println("Reading test class from " + f);
InputStream redefineStream = new FileInputStream(f);
byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);
ClassDefinition redefineParamBlock = new ClassDefinition( ExampleRedefine.class,
redefineBuffer);
fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
int thirdGet = ex.get();
ex.doSomething();
int fourthGet = ex.get();
assertEquals(thirdGet + 1, fourthGet);
}
public void
testUnmodifiableClassException()
throws Throwable
{
System.out.println("Testing UnmodifiableClassException");
// Load any class
File f = new File("Different_ExampleRedefine.class");
InputStream redefineStream = new FileInputStream(f);
byte[] redefineBuffer = NamedBuffer.loadBufferFromStream(redefineStream);
System.out.println("Try to redefine class for primitive type");
try {
ClassDefinition redefineParamBlock =
new ClassDefinition( byte.class, redefineBuffer );
fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
fail();
} catch (UnmodifiableClassException x) {
}
System.out.println("Try to redefine class for array type");
try {
ClassDefinition redefineParamBlock =
new ClassDefinition( byte[].class, redefineBuffer );
fInst.redefineClasses(new ClassDefinition[] {redefineParamBlock});
fail();
} catch (UnmodifiableClassException x) {
}
}
}