Troubleshooting Guide Java Platform, Standard Edition
Java Platform, Standard Edition
Troubleshooting Guide
Release 13
F17440-01
September 2019
Java Platform, Standard Edition Troubleshooting Guide, Release 13
F17440-01
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Contents
Preface
Audience
xi
Documentation Accessibility
xi
Related Documents
xi
Conventions
xi
Part I
1
General Java Troubleshooting
Prepare Java for Troubleshooting
Set Up Java for Troubleshooting
1-1
Enable Options and Flags for JVM Troubleshooting
1-1
Gather Relevant Data
1-3
Make a Java Application Easier to Debug
2
1-3
Diagnostic Tools
Diagnostic Tools Overview
2-1
Flight Recorder
2-2
About Flight Recordings
2-3
Produce a Flight Recording
2-4
Inspect a Flight Recording
2-5
The jcmd Utility
2-6
Useful Commands for the jcmd Utility
2-8
Troubleshoot with the jcmd Utility
2-9
Native Memory Tracking
2-9
Use NMT to Detect a Memory Leak
2-10
How to Monitor VM Internal Memory
2-10
NMT Memory Categories
2-15
JConsole
2-16
Troubleshoot with the JConsole Tool
2-16
Monitor Local and Remote Applications with JConsole
2-18
iii
The jdb Utility
Troubleshoot with the jdb Utility
The jinfo Utility
Troubleshooting with the jinfo Utility
The jmap Utility
2-19
2-20
2-21
2-22
Heap Configuration and Usage
2-22
Heap Histogram
2-23
Class Loader Statistics
2-25
The jps Utility
2-27
The jrunscript Utility
2-27
The jstack Utility
2-27
Troubleshoot with the jstack Utility
2-28
Stack Trace from a Core Dump
2-28
Mixed Stack
2-28
The jstat Utility
2-30
The visualgc Tool
2-32
Control+Break Handler
2-33
Thread Dump
2-33
Thread States for a Thread Dump
2-34
Detect Deadlocks
2-35
Heap Summary
2-35
Native Operating System Tools
2-36
Troubleshooting Tools Based on the Operating System
2-36
Probe Providers in Java HotSpot VM
2-37
Custom Diagnostic Tools
3
2-19
2-38
The java.lang.management Package
2-39
The java.lang.instrument Package
2-39
The java.lang.Thread Class
2-39
JVM Tool Interface
2-40
Java Platform Debugger Architecture
2-40
Postmortem Diagnostic Tools
2-40
Hung Processes Tools
2-41
Monitoring Tools
2-42
Other Tools, Options, Variables, and Properties
2-43
The jstatd Daemon
2-44
Troubleshoot Memory Leaks
Debug a Memory Leak Using Flight Recorder
3-1
Understand the OutOfMemoryError Exception
3-4
Troubleshoot a Crash Instead of OutOfMemoryError
3-7
iv
Diagnose Leaks in Java Language Code
Get a Heap Histogram
3-8
Monitor the Objects Pending Finalization
3-9
Diagnose Leaks in Native Code
4
Track All Memory Allocation and Free Calls
3-10
Track All Memory Allocations in the JNI Library
3-10
Track Memory Allocation with Operating System Support
3-11
Flight Recorder Overhead
4-1
Find Bottlenecks
4-2
Garbage Collection Performance
4-3
Synchronization Performance
4-4
I/O Performance
4-5
Code Execution Performance
4-5
Debug JVM Issues
Troubleshoot System Crashes
Determine Where the Crash Occurred
5-1
Crash the Native Code
5-2
Crash in the Compiled Code
5-3
Crash in the HotSpot Compiler Thread
5-4
Crash in the VM Thread
5-4
Crash Due to Stack Overflow
5-4
Find a Workaround
5-6
Working Around Crashes in the HotSpot Compiler Thread or Compiled Code
5-6
Working Around Crashes During Garbage Collection
5-8
Working Around Crashes Caused by Class Data Sharing
Microsoft Visual C++ Version Considerations
6
3-9
Troubleshoot Performance Issues Using Flight Recorder
Part II
5
3-7
5-10
5-10
Troubleshoot Process Hangs and Loops
Diagnose a Loop Process
6-1
Diagnose a Hung Process
6-2
Deadlock Detected
6-2
Deadlock Not Detected
6-4
No Thread Dump
6-4
v
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