From vyazelenko at yahoo.com  Mon Sep  4 20:14:19 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Mon, 4 Sep 2017 20:14:19 +0000 (UTC)
Subject: OOME from GraphLayout.parseInstance().toFootprint()
References: <894754757.2631556.1504556059288.ref@mail.yahoo.com>
Message-ID: <894754757.2631556.1504556059288@mail.yahoo.com>

Hi,

I have the following code that throws OutOfMemoryError on 8 GB heap:

LinkedList<Integer> linkedList = new LinkedList<>();for (int i = 0; i < 1_000_000; i++) {? linkedList.add(i);}System.out.println(GraphLayout.parseInstance(linkedList).toFootprint());
The problem is with the GraphWalker which accumulates GraphPathRecord objects whose path field is ever growing but in the case of toFootprint() call this field is not used at all.
Suggestion: compute path lazily in path() method using a reference to parent GraphPathRecord object. 

Best regards, 
Dmitry Vyazelenko

From vyazelenko at yahoo.com  Mon Sep  4 20:22:43 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Mon, 4 Sep 2017 20:22:43 +0000 (UTC)
Subject: java.lang.ArithmeticException: / by zero
References: <2072298330.2632944.1504556563378.ref@mail.yahoo.com>
Message-ID: <2072298330.2632944.1504556563378@mail.yahoo.com>

Hi,

Using JOL 0.8 and 0.9-SNAPSHOT I get the following exception:
Exception in thread "main" java.lang.ArithmeticException: / by zero
?? ?at org.openjdk.jol.info.GraphLayout.toImage(GraphLayout.java:354)
?? ?at DivisionByZero.main(DivisionByZero.java:8)

>From the following code:
import org.openjdk.jol.info.GraphLayout;import java.io.IOException;public class DivisionByZero {?? ? public static void main(String[] args) throws IOException {?????????? int[] array = new int[10];?????? ??? GraphLayout.parseInstance(array).toImage("array.jpg");?? ? }}
Best regards, Dmitry Vyazelenko

From vyazelenko at yahoo.com  Mon Sep  4 20:33:35 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Mon, 4 Sep 2017 20:33:35 +0000 (UTC)
Subject: Using JOL with JDK 9+181
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
Message-ID: <471795616.2660847.1504557215282@mail.yahoo.com>

Hi,

I'm trying to use JOL with the latest JDK 9 build:
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

But get tons of warnings when I try to run any of the JOL samples, e.g.:
/home/jdk-9/bin/java -classpath /home/projects/jol/jol-samples/target/classes:/home/projects/jol/jol-core/target/classes org.openjdk.jol.samples.JOLSample_01_Basic 
?
# WARNING: Unable to get Instrumentation. Dynamic Attach failed: null. You may add this JAR as -javaagent manually.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.openjdk.jol.vm.sa.ServiceabilityAgentSupport (file:/home/dmitry/projects/oss/jol/jol-core/target/classes/) to field sun.management.RuntimeImpl.jvm
WARNING: Please consider reporting this to the maintainers of org.openjdk.jol.vm.sa.ServiceabilityAgentSupport
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
# Running 64-bit HotSpot VM.
# Using compressed oop with 3-bit shift.
# Using compressed klass with 3-bit shift.
# Objects are 8 bytes aligned.
# Field sizes by type: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]
# Array element sizes: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]

org.openjdk.jol.samples.JOLSample_01_Basic$A object internals:
?OFFSET? SIZE????? TYPE DESCRIPTION?????????????????????????????? VALUE
????? 0??? 12?????????? (object header)?????????????????????????? N/A
???? 12???? 1?? boolean A.f?????????????????????????????????????? N/A
???? 13???? 3?????????? (loss due to the next object alignment)
Instance size: 16 bytes
Space losses: 0 bytes internal + 3 bytes external = 3 bytes total

Any idea on how to fix those?

Best regards, 
Dmitry Vyazelenko

From vyazelenko at yahoo.com  Thu Sep 21 17:30:02 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Thu, 21 Sep 2017 19:30:02 +0200
Subject: java.lang.ArithmeticException: / by zero
References: <2072298330.2632944.1504556563378.ref@mail.yahoo.com>
Message-ID: <87CB442D-3705-4F39-B564-1FBBE2E0F289@yahoo.com>

Hi,

Using JOL 0.8 and 0.9-SNAPSHOT I get the following exception:
Exception in thread "main" java.lang.ArithmeticException: / by zero
    at org.openjdk.jol.info.GraphLayout.toImage(GraphLayout.java:354)
    at DivisionByZero.main(DivisionByZero.java:8)

From the following code:
import org.openjdk.jol.info.GraphLayout;
import java.io.IOException;
public class DivisionByZero {  
  public static void main(String[] args) throws IOException {       
    int[] array = new int[10];      
    GraphLayout.parseInstance(array).toImage("array.jpg");   
  }
}

Best regards,
Dmitry Vyazelenko

From vyazelenko at yahoo.com  Thu Sep 21 17:29:51 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Thu, 21 Sep 2017 19:29:51 +0200
Subject: OOME from GraphLayout.parseInstance().toFootprint()
References: <894754757.2631556.1504556059288.ref@mail.yahoo.com>
Message-ID: <D31DE3E9-995B-47A5-AB87-156EBF36C563@yahoo.com>

Hi,

I have the following code that throws OutOfMemoryError on 8 GB heap:

LinkedList<Integer> linkedList = new LinkedList<>();
for (int i = 0; i < 1_000_000; i++) {
  linkedList.add(i);
}
System.out.println(GraphLayout.parseInstance(linkedList).toFootprint());

The problem is with the GraphWalker which accumulates GraphPathRecord objects whose path field is ever growing but in the case of toFootprint() call this field is not used at all.

Suggestion: compute path lazily in path() method using a reference to parent GraphPathRecord object. 

Best regards, 
Dmitry Vyazelenko

From ashipile at redhat.com  Fri Sep 22 09:26:07 2017
From: ashipile at redhat.com (ashipile at redhat.com)
Date: Fri, 22 Sep 2017 09:26:07 +0000
Subject: hg: code-tools/jol: 3 new changesets
Message-ID: <201709220926.v8M9Q7w8005129@aojmv0008.oracle.com>

Changeset: 3c3ce1bbb26b
Author:    shade
Date:      2017-09-22 10:27 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/3c3ce1bbb26b

7902037: Make sure JOL builds and runs with JDK 9 GA

! jol-cli/pom.xml
! jol-core/pom.xml
! jol-samples/pom.xml
! pom.xml

Changeset: abd8229a4600
Author:    shade
Date:      2017-09-22 10:37 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/abd8229a4600

7902036: JOL image builder ignores the tail of the object

! jol-core/src/main/java/org/openjdk/jol/info/GraphLayout.java
+ jol-core/src/test/java/org/openjdk/jol/info/GraphLayoutImageTests.java

Changeset: ff23bb91bb1f
Author:    shade
Date:      2017-09-22 11:23 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/ff23bb91bb1f

7902038: JDK 9 compatibility fixes for Serviceability and Dynamic Attach

! jol-core/src/main/java/org/openjdk/jol/vm/InstrumentationSupport.java
! jol-core/src/main/java/org/openjdk/jol/vm/sa/ServiceabilityAgentSupport.java


From shade at redhat.com  Fri Sep 22 09:25:29 2017
From: shade at redhat.com (Aleksey Shipilev)
Date: Fri, 22 Sep 2017 11:25:29 +0200
Subject: java.lang.ArithmeticException: / by zero
In-Reply-To: <87CB442D-3705-4F39-B564-1FBBE2E0F289@yahoo.com>
References: <2072298330.2632944.1504556563378.ref@mail.yahoo.com>
 <87CB442D-3705-4F39-B564-1FBBE2E0F289@yahoo.com>
Message-ID: <51bb604a-7c14-4f8c-5d13-7b37012f0073@redhat.com>

On 09/21/2017 07:30 PM, Dmitry Vyazelenko wrote:
> Hi,
> 
> Using JOL 0.8 and 0.9-SNAPSHOT I get the following exception:
> Exception in thread "main" java.lang.ArithmeticException: / by zero
>     at org.openjdk.jol.info.GraphLayout.toImage(GraphLayout.java:354)
>     at DivisionByZero.main(DivisionByZero.java:8)
> 
> From the following code:
> import org.openjdk.jol.info.GraphLayout;
> import java.io.IOException;
> public class DivisionByZero {  
>   public static void main(String[] args) throws IOException {       
>     int[] array = new int[10];      
>     GraphLayout.parseInstance(array).toImage("array.jpg");   
>   }
> }

Thanks for the bug report. Apparently I had the fix that accidentally resolved this:
  https://bugs.openjdk.java.net/browse/CODETOOLS-7902036

-Aleksey


From shade at redhat.com  Fri Sep 22 09:27:08 2017
From: shade at redhat.com (Aleksey Shipilev)
Date: Fri, 22 Sep 2017 11:27:08 +0200
Subject: Using JOL with JDK 9+181
In-Reply-To: <471795616.2660847.1504557215282@mail.yahoo.com>
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
 <471795616.2660847.1504557215282@mail.yahoo.com>
Message-ID: <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>

On 09/04/2017 10:33 PM, Dmitry Vyazelenko wrote:
> # WARNING: Unable to get Instrumentation. Dynamic Attach failed: null. You may add this JAR as -javaagent manually.
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by org.openjdk.jol.vm.sa.ServiceabilityAgentSupport (file:/home/dmitry/projects/oss/jol/jol-core/target/classes/) to field sun.management.RuntimeImpl.jvm
> WARNING: Please consider reporting this to the maintainers of org.openjdk.jol.vm.sa.ServiceabilityAgentSupport
> WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> ...
> Any idea on how to fix those?

These are partially fixed by:
  https://bugs.openjdk.java.net/browse/CODETOOLS-7902038

See:

$ java -version
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

$ java -Djdk.attach.allowAttachSelf -jar jol-cli/target/jol-cli.jar internals java.lang.Object
# Running 64-bit HotSpot VM.
# Using compressed oop with 3-bit shift.
# Using compressed klass with 0x0000000800000000 base address and 0-bit shift.
# Objects are 8 bytes aligned.
# Field sizes by type: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]
# Array element sizes: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]

Instantiated the sample instance via default constructor.
....

Thanks,
-Aleksey


From ashipile at redhat.com  Fri Sep 22 10:02:55 2017
From: ashipile at redhat.com (ashipile at redhat.com)
Date: Fri, 22 Sep 2017 10:02:55 +0000
Subject: hg: code-tools/jol: 7902039: GraphLayout.parseInstance OOMEs on large
 linked lists
Message-ID: <201709221002.v8MA2tCD019628@aojmv0008.oracle.com>

Changeset: b243278c8397
Author:    shade
Date:      2017-09-22 11:59 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/b243278c8397

7902039: GraphLayout.parseInstance OOMEs on large linked lists

! jol-core/src/main/java/org/openjdk/jol/info/GraphPathRecord.java
! jol-core/src/main/java/org/openjdk/jol/info/GraphWalker.java
+ jol-core/src/test/java/org/openjdk/jol/info/GraphLayoutExhaustionTests.java


From shade at redhat.com  Fri Sep 22 10:01:16 2017
From: shade at redhat.com (Aleksey Shipilev)
Date: Fri, 22 Sep 2017 12:01:16 +0200
Subject: OOME from GraphLayout.parseInstance().toFootprint()
In-Reply-To: <894754757.2631556.1504556059288@mail.yahoo.com>
References: <894754757.2631556.1504556059288.ref@mail.yahoo.com>
 <894754757.2631556.1504556059288@mail.yahoo.com>
Message-ID: <e53abac2-b988-2096-a792-b8b91ac773f6@redhat.com>

On 09/04/2017 10:14 PM, Dmitry Vyazelenko wrote:
> Suggestion: compute path lazily in path() method using a reference to parent GraphPathRecord object. 

Good idea. This should be fixed with:
 https://bugs.openjdk.java.net/browse/CODETOOLS-7902039

It would be nice if you can quickly check all recent patches work for your correctly -- then we can
do the patch release.

Thanks,
-Aleksey


From vyazelenko at yahoo.com  Fri Sep 22 17:02:33 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Fri, 22 Sep 2017 17:02:33 +0000 (UTC)
Subject: Using JOL with JDK 9+181
In-Reply-To: <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
 <471795616.2660847.1504557215282@mail.yahoo.com>
 <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>
Message-ID: <491461804.402190.1506099753213@mail.yahoo.com>

Works as described when -Djdk.attach.allowAttachSelf property is set. Why can't it be set by JOL automatically in the same way as --add-modules/--add-exports is done?

Best regards, Dmitry Vyazelenko 

    On Friday, September 22, 2017, 11:27:14 AM GMT+2, Aleksey Shipilev <shade at redhat.com> wrote:  
 
 On 09/04/2017 10:33 PM, Dmitry Vyazelenko wrote:
> # WARNING: Unable to get Instrumentation. Dynamic Attach failed: null. You may add this JAR as -javaagent manually.
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by org.openjdk.jol.vm.sa.ServiceabilityAgentSupport (file:/home/dmitry/projects/oss/jol/jol-core/target/classes/) to field sun.management.RuntimeImpl.jvm
> WARNING: Please consider reporting this to the maintainers of org.openjdk.jol.vm.sa.ServiceabilityAgentSupport
> WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> ...
> Any idea on how to fix those?

These are partially fixed by:
? https://bugs.openjdk.java.net/browse/CODETOOLS-7902038

See:

$ java -version
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

$ java -Djdk.attach.allowAttachSelf -jar jol-cli/target/jol-cli.jar internals java.lang.Object
# Running 64-bit HotSpot VM.
# Using compressed oop with 3-bit shift.
# Using compressed klass with 0x0000000800000000 base address and 0-bit shift.
# Objects are 8 bytes aligned.
# Field sizes by type: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]
# Array element sizes: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]

Instantiated the sample instance via default constructor.
....

Thanks,
-Aleksey
  

From shade at redhat.com  Fri Sep 22 17:23:03 2017
From: shade at redhat.com (Aleksey Shipilev)
Date: Fri, 22 Sep 2017 19:23:03 +0200
Subject: Using JOL with JDK 9+181
In-Reply-To: <491461804.402190.1506099753213@mail.yahoo.com>
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
 <471795616.2660847.1504557215282@mail.yahoo.com>
 <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>
 <491461804.402190.1506099753213@mail.yahoo.com>
Message-ID: <bd3ce82f-a6e6-849f-626e-876a2c4dfb33@redhat.com>

On 09/22/2017 07:02 PM, Dmitry Vyazelenko wrote:
> Works as described when -Djdk.attach.allowAttachSelf property is set. Why can't it be set by JOL
> automatically in the same way as --add-modules/--add-exports is done?

Those are set for *forked* VM. We need to get Instrumentation instance in *current* VM. Too late to
specify options :)

-Aleksey


From vyazelenko at yahoo.com  Fri Sep 22 17:22:14 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Fri, 22 Sep 2017 17:22:14 +0000 (UTC)
Subject: Using JOL with JDK 9+181
In-Reply-To: <491461804.402190.1506099753213@mail.yahoo.com>
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
 <471795616.2660847.1504557215282@mail.yahoo.com>
 <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>
 <491461804.402190.1506099753213@mail.yahoo.com>
Message-ID: <600095884.430908.1506100934988@mail.yahoo.com>

BTW, I'm still getting these warning while building JOL:
-------------------------------------------------------
?T E S T S
-------------------------------------------------------
Running org.openjdk.jol.info.ClassLayoutPrivatesTest
# WARNING: Unable to get Instrumentation. Dynamic Attach failed. You may add this JAR as -javaagent manually, or supply -Djdk.attach.allowAttachSelf
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.openjdk.jol.util.ObjectUtils (file:/home/dmitry/projects/oss/jol/jol-core/target/classes/) to field java.lang.Class.cachedConstructor
WARNING: Please consider reporting this to the maintainers of org.openjdk.jol.util.ObjectUtils
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.728 sec
Running org.openjdk.jol.info.ClassLayoutInstanceTest

Is it expected?

Best regards, Dmitry Vyazelenko 

    On Friday, September 22, 2017, 7:02:33 PM GMT+2, Dmitry Vyazelenko <vyazelenko at yahoo.com> wrote:  
 
 Works as described when -Djdk.attach.allowAttachSelf property is set. Why can't it be set by JOL automatically in the same way as --add-modules/--add-exports is done?

Best regards, Dmitry Vyazelenko 

    On Friday, September 22, 2017, 11:27:14 AM GMT+2, Aleksey Shipilev <shade at redhat.com> wrote:  
 
 On 09/04/2017 10:33 PM, Dmitry Vyazelenko wrote:
> # WARNING: Unable to get Instrumentation. Dynamic Attach failed: null. You may add this JAR as -javaagent manually.
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by org.openjdk.jol.vm.sa.ServiceabilityAgentSupport (file:/home/dmitry/projects/oss/jol/jol-core/target/classes/) to field sun.management.RuntimeImpl.jvm
> WARNING: Please consider reporting this to the maintainers of org.openjdk.jol.vm.sa.ServiceabilityAgentSupport
> WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
> WARNING: All illegal access operations will be denied in a future release
> ...
> Any idea on how to fix those?

These are partially fixed by:
? https://bugs.openjdk.java.net/browse/CODETOOLS-7902038

See:

$ java -version
java version "9"
Java(TM) SE Runtime Environment (build 9+181)
Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode)

$ java -Djdk.attach.allowAttachSelf -jar jol-cli/target/jol-cli.jar internals java.lang.Object
# Running 64-bit HotSpot VM.
# Using compressed oop with 3-bit shift.
# Using compressed klass with 0x0000000800000000 base address and 0-bit shift.
# Objects are 8 bytes aligned.
# Field sizes by type: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]
# Array element sizes: 4, 1, 1, 2, 2, 4, 4, 8, 8 [bytes]

Instantiated the sample instance via default constructor.
....

Thanks,
-Aleksey
    

From vyazelenko at yahoo.com  Fri Sep 22 17:29:17 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Fri, 22 Sep 2017 17:29:17 +0000 (UTC)
Subject: OOME from GraphLayout.parseInstance().toFootprint()
In-Reply-To: <e53abac2-b988-2096-a792-b8b91ac773f6@redhat.com>
References: <894754757.2631556.1504556059288.ref@mail.yahoo.com>
 <894754757.2631556.1504556059288@mail.yahoo.com>
 <e53abac2-b988-2096-a792-b8b91ac773f6@redhat.com>
Message-ID: <1310164271.418017.1506101357243@mail.yahoo.com>

All reported problems have been fixed.
Great job!

Best regards, Dmitry Vyazelenko 

    On Friday, September 22, 2017, 12:01:25 PM GMT+2, Aleksey Shipilev <shade at redhat.com> wrote:  
 
 On 09/04/2017 10:14 PM, Dmitry Vyazelenko wrote:
> Suggestion: compute path lazily in path() method using a reference to parent GraphPathRecord object. 

Good idea. This should be fixed with:
 https://bugs.openjdk.java.net/browse/CODETOOLS-7902039

It would be nice if you can quickly check all recent patches work for your correctly -- then we can
do the patch release.

Thanks,
-Aleksey
  

From vyazelenko at yahoo.com  Fri Sep 22 17:41:56 2017
From: vyazelenko at yahoo.com (Dmitry Vyazelenko)
Date: Fri, 22 Sep 2017 17:41:56 +0000 (UTC)
Subject: Using JOL with JDK 9+181
In-Reply-To: <bd3ce82f-a6e6-849f-626e-876a2c4dfb33@redhat.com>
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
 <471795616.2660847.1504557215282@mail.yahoo.com>
 <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>
 <491461804.402190.1506099753213@mail.yahoo.com>
 <bd3ce82f-a6e6-849f-626e-876a2c4dfb33@redhat.com>
Message-ID: <1785784734.441711.1506102116974@mail.yahoo.com>

Ok, it's clear now. ;)
Regards,Dmitry

    On Friday, September 22, 2017, 7:23:18 PM GMT+2, Aleksey Shipilev <shade at redhat.com> wrote:  
 
 On 09/22/2017 07:02 PM, Dmitry Vyazelenko wrote:
> Works as described when -Djdk.attach.allowAttachSelf property is set. Why can't it be set by JOL
> automatically in the same way as --add-modules/--add-exports is done?

Those are set for *forked* VM. We need to get Instrumentation instance in *current* VM. Too late to
specify options :)

-Aleksey
  

From ashipile at redhat.com  Fri Sep 22 18:25:43 2017
From: ashipile at redhat.com (ashipile at redhat.com)
Date: Fri, 22 Sep 2017 18:25:43 +0000
Subject: hg: code-tools/jol: 4 new changesets
Message-ID: <201709221825.v8MIPh6N003640@aojmv0008.oracle.com>

Changeset: 9ac332c76185
Author:    shade
Date:      2017-09-22 17:28 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/9ac332c76185

Make sure jol-samples Javadoc JAR is generated

+ jol-samples/src/main/java/org/openjdk/jol/Sample.java

Changeset: 9a5fff552b23
Author:    shade
Date:      2017-09-22 17:29 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/9a5fff552b23

JOL v0.9.

! jol-cli/pom.xml
! jol-core/pom.xml
! jol-samples/pom.xml
! pom.xml

Changeset: afd0b2e94067
Author:    shade
Date:      2017-09-22 17:29 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/afd0b2e94067

Added tag 0.9 for changeset 9a5fff552b23

! .hgtags

Changeset: 03064c057dc9
Author:    shade
Date:      2017-09-22 17:29 +0200
URL:       http://hg.openjdk.java.net/code-tools/jol/rev/03064c057dc9

Continue in 0.10-SNAPSHOT.

! jol-cli/pom.xml
! jol-core/pom.xml
! jol-samples/pom.xml
! pom.xml


From shade at redhat.com  Fri Sep 22 18:23:51 2017
From: shade at redhat.com (Aleksey Shipilev)
Date: Fri, 22 Sep 2017 20:23:51 +0200
Subject: Using JOL with JDK 9+181
In-Reply-To: <600095884.430908.1506100934988@mail.yahoo.com>
References: <471795616.2660847.1504557215282.ref@mail.yahoo.com>
 <471795616.2660847.1504557215282@mail.yahoo.com>
 <e2517b77-aae5-6599-25bc-d872ff0772df@redhat.com>
 <491461804.402190.1506099753213@mail.yahoo.com>
 <600095884.430908.1506100934988@mail.yahoo.com>
Message-ID: <7eebe11c-c8bd-277d-d421-ee6dc4a40e40@redhat.com>

On 09/22/2017 07:22 PM, Dmitry Vyazelenko wrote:
> BTW, I'm still getting these warning while building JOL:
> 
> -------------------------------------------------------
> ?T E S T S
> -------------------------------------------------------
> Running org.openjdk.jol.info.ClassLayoutPrivatesTest
> # WARNING: Unable to get Instrumentation. Dynamic Attach failed. You may add this JAR as -javaagent
> manually, or supply -Djdk.attach.allowAttachSelf
> WARNING: An illegal reflective access operation has occurred
> WARNING: Illegal reflective access by org.openjdk.jol.util.ObjectUtils
> (file:/home/dmitry/projects/oss/jol/jol-core/target/classes/) to field java.lang.Class.cachedConstructor
> WARNING: Please consider reporting this to the maintainers of org.openjdk.jol.util.ObjectUtils
> WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
> WARNING: All illegal access operations will be denied in a future release

Yes, that's a legit failure when JOL tries to poll fields with Reflection. It is expected to produce
warnings like that.

-Aleksey


From shade at redhat.com  Fri Sep 22 18:53:40 2017
From: shade at redhat.com (Aleksey Shipilev)
Date: Fri, 22 Sep 2017 20:53:40 +0200
Subject: JOL 0.9
Message-ID: <e6c5c1b2-603d-f2ee-c073-fdd923d5551a@redhat.com>

Hi,

JOL 0.9 is released and available on Maven Central. This is the patch release, and it brings these
changes forward:

 *) JOL can now be built and executed on JDK 9 GA. It was possible to run it on JDK 9 EA builds, and
this release does the final compatibility touchups:
   https://bugs.openjdk.java.net/browse/CODETOOLS-7901973
   https://bugs.openjdk.java.net/browse/CODETOOLS-7902037
   https://bugs.openjdk.java.net/browse/CODETOOLS-7902038

 *) GraphLayout.toImage had bugs with rendering the tail objects. In the trivial case of single
object it would not have rendered anything. Fixed:
   https://bugs.openjdk.java.net/browse/CODETOOLS-7902036

 *) GraphLayout used to store lots of Strings describing the path from the roots, which consumed
lots of memory. Analyzing a simple 1M LinkedList OOMEd on >8 GB heaps. Fixed:
   https://bugs.openjdk.java.net/browse/CODETOOLS-7902039

As usual, runnable JAR is available as additional artifact:
   http://central.maven.org/maven2/org/openjdk/jol/jol-cli/0.9/jol-cli-0.9-full.jar

Thanks,
-Aleksey