记录一次HSDB的使用遇到的问题 No such type.

univese
Unrecognized command.  Try help...
hsdb> universe
Heap Parameters:
Gen 0:   eden [0x00000000ff600000,0x00000000ff6bca68,0x00000000ff8b0000) space capacity = 2818048, 27.420114916424417 used
  from [0x00000000ff8b0000,0x00000000ff8b0000,0x00000000ff900000) space capacity = 327680, 0.0 used
  to   [0x00000000ff900000,0x00000000ff900000,0x00000000ff950000) space capacity = 327680, 0.0 usedInvocations: 0

Gen 1:   old  [0x00000000ff950000,0x00000000ff950000,0x0000000100000000) space capacity = 7012352, 0.0 usedInvocations: 0

hsdb> scanoops 0x00000000ff600000 0x00000000ff950000 Test2
No such type.
hsdb>  scanoops 0x00000000ff600000 0x00000000ff950000 com.zyt.test.jvmhsdb.Test2
0x00000000ff6af668 com/zyt/test/jvmhsdb/Test2
0x00000000ff6af688 com/zyt/test/jvmhsdb/Test2
0x00000000ff6af698 com/zyt/test/jvmhsdb/Test2
hsdb> 

idea中代码

public class Test {
    static Test2 t1 = new Test2();
    Test2 t2 = new Test2();
    public void fn() throws IOException {
        Test2 t3 = new Test2();
        System.in.read();
    }
}

class Test2 {

}

Main

public class MainTest {
    public static void main(String[] args) throws IOException {
        Test test = new Test();
        test.fn();
    }
}

设置VM参数

-XX:+UseSerialGC -Xmx10m

最重要的是要scanoops的时候加入com.zyt.test.jvmhsdb.Test2,包名否则就报找不到错误