Closed swpalmer closed 1 year ago
It was generated with jlink and includes the following modules
Aha, this is new to me. This can cause your problem. Can you try with stock Zulu17.28+13-CA? I gues that you are missing some modules.
You can also install VisualVM-MBeans
plugin and see if you have OperatingSystem
MBeans with ProcessCpuTime
attribute. See the screenshot below:
I guess that the missing module is jdk.management
.
Another system where CPU usage is reported has the following modules: com.azul.crs.client@17.0.5 com.azul.tooling@17.0.5 java.base@17.0.5 java.compiler@17.0.5 java.datatransfer@17.0.5 java.desktop@17.0.5 java.instrument@17.0.5 java.logging@17.0.5 java.management@17.0.5 java.management.rmi@17.0.5 java.naming@17.0.5 java.net.http@17.0.5 java.prefs@17.0.5 java.rmi@17.0.5 java.scripting@17.0.5 java.se@17.0.5 java.security.jgss@17.0.5 java.security.sasl@17.0.5 java.smartcardio@17.0.5 java.sql@17.0.5 java.sql.rowset@17.0.5 java.transaction.xa@17.0.5 java.xml@17.0.5 java.xml.crypto@17.0.5 javafx.base@17.0.5 javafx.controls@17.0.5 javafx.fxml@17.0.5 javafx.graphics@17.0.5 javafx.media@17.0.5 javafx.swing@17.0.5 javafx.web@17.0.5 jdk.accessibility@17.0.5 jdk.attach@17.0.5 jdk.crypto.cryptoki@17.0.5 jdk.crypto.ec@17.0.5 jdk.crypto.mscapi@17.0.5 jdk.hotspot.agent@17.0.5 jdk.httpserver@17.0.5 jdk.internal.jvmstat@17.0.5 jdk.jdwp.agent@17.0.5 jdk.jfr@17.0.5 jdk.jsobject@17.0.5 jdk.management.agent@17.0.5 jdk.unsupported@17.0.5 jdk.unsupported.desktop@17.0.5 jdk.xml.dom@17.0.5
There is still no jdk.management, just jdk.management.agent, which is present on both. That leaves the following modules the only difference: com.azul.crs.client@17.0.5 com.azul.tooling@17.0.5 jdk.jfr@17.0.5
I bet some of thise extra modules has dependecy on jdk.management
. If you take a heap dump, VisualVM can tell you in heap dump "Summary", which modules are present in the heap dump (GH-275).
If they did have such a dependency, then the module would end up in the JDK and be listed, would it not?
Nevermind... my information about the "working" system was wrong. It was not running on JDK 17! (It was supposed to be, but I made a mistake somewhere)
That was the issue. Adding the jdk.management module was all that was needed. Thank you!
Describe the bug The monitoring tab shows "CPU usage:", while other features are working as expected.
To Reproduce Steps to reproduce the behavior:
Run application with Zulu build of OpenJDK java.vm.specification.version=17 java.vm.vendor=Azul Systems, Inc. java.vm.version=17+35-LTS javafx.runtime.version=17.0.0+100 javafx.version=17.0.0
Run VisualVM with Zulu JDK 19 System Info: Product Version = VisualVM 2.1.5 Operating System = Windows 11 version 10.0 running on amd64 Java; VM; Vendor = 19.0.1; OpenJDK 64-Bit Server VM 19.0.1+10; Azul Systems, Inc. Runtime = OpenJDK Runtime Environment 19.0.1+10 Java Home = C:\Program Files\Zulu\zulu-19
Double click the application in the Appications list to connect
Go to the Monitor tab
Notice all 4 graphs are active, but CPU usage for the application says, GC activity says 0.0%
Expected behavior CPU usage should be visible.
VisualVM log cpu_unknown_logfile.txt
Screenshots![image](https://user-images.githubusercontent.com/757620/212692440-c46ac03b-8cea-4530-854b-8b779e90028b.png)
Desktop (please complete the following information):
Additional context Application is running a JavaFX GUI and makes extensive use of JNI. Runtime of monitored application is: openjdk 17 2021-09-14 LTS OpenJDK Runtime Environment Zulu17.28+13-CA (build 17+35-LTS) OpenJDK 64-Bit Server VM Zulu17.28+13-CA (build 17+35-LTS, mixed mode)
It was generated with jlink and includes the following modules: java.base@17 java.compiler@17 java.datatransfer@17 java.desktop@17 java.instrument@17 java.logging@17 java.management@17 java.management.rmi@17 java.naming@17 java.net.http@17 java.prefs@17 java.rmi@17 java.scripting@17 java.se@17 java.security.jgss@17 java.security.sasl@17 java.smartcardio@17 java.sql@17 java.sql.rowset@17 java.transaction.xa@17 java.xml@17 java.xml.crypto@17 javafx.base@17 javafx.controls@17 javafx.fxml@17 javafx.graphics@17 javafx.media@17 javafx.swing@17 javafx.web@17 jdk.accessibility@17 jdk.attach@17 jdk.crypto.cryptoki@17 jdk.crypto.ec@17 jdk.crypto.mscapi@17 jdk.hotspot.agent@17 jdk.httpserver@17 jdk.internal.jvmstat@17 jdk.jdwp.agent@17 jdk.jsobject@17 jdk.management.agent@17 jdk.unsupported@17 jdk.unsupported.desktop@17 jdk.xml.dom@17