8027959: Early reclamation of large objects in G1
Summary: Try to reclaim humongous objects at every young collection after doing a conservative estimate of its liveness.
Reviewed-by: brutisso, mgerdin
/*
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* 2 along with this work; if not, write to the Free Software Foundation,
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/*
* @test
* @bug 4502729 7054918
* @summary BasicPermissionCollection serial version UID incorrect
*/
import java.security.*;
import java.io.*;
public class SerialVersion {
public static void main(String[] args) throws Exception {
String dir = System.getProperty("test.src");
File sFile = new File (dir,"SerialVersion.1.2.1");
// read in a 1.2.1 BasicPermissionCollection
try (FileInputStream fis = new FileInputStream(sFile);
ObjectInputStream ois = new ObjectInputStream(fis)) {
PermissionCollection pc = (PermissionCollection)ois.readObject();
System.out.println("1.2.1 collection = " + pc);
}
// read in a 1.3.1 BasicPermissionCollection
sFile = new File (dir,"SerialVersion.1.3.1");
try (FileInputStream fis = new FileInputStream(sFile);
ObjectInputStream ois = new ObjectInputStream(fis)) {
PermissionCollection pc = (PermissionCollection)ois.readObject();
System.out.println("1.3.1 collection = " + pc);
}
// read in a 1.4 BasicPermissionCollection
sFile = new File (dir,"SerialVersion.1.4");
try (FileInputStream fis = new FileInputStream(sFile);
ObjectInputStream ois = new ObjectInputStream(fis)) {
PermissionCollection pc = (PermissionCollection)ois.readObject();
System.out.println("1.4 collection = " + pc);
}
// write out current BasicPermissionCollection
MyPermission mp = new MyPermission("SerialVersionTest");
PermissionCollection bpc = mp.newPermissionCollection();
sFile = new File (dir,"SerialVersion.current");
try (FileOutputStream fos = new FileOutputStream("SerialVersion.current");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
oos.writeObject(bpc);
}
// read in current BasicPermissionCollection
try (FileInputStream fis = new FileInputStream("SerialVersion.current");
ObjectInputStream ois = new ObjectInputStream(fis)) {
PermissionCollection pc = (PermissionCollection)ois.readObject();
System.out.println("current collection = " + pc);
}
}
}
class MyPermission extends BasicPermission {
public MyPermission(String name) {
super(name);
}
}