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Fix Java PrintMetaspaceStatistics Error

Fix Java PrintMetaspaceStatistics JVM flag errors. Resolve unrecognized VM option, tty issues, and monitor metaspace usage in Java 8 and later versions.

Published: Apr 27, 20267 min readBy FixWikiHub Editorial Team

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# Fix Java PrintMetaspaceStatistics Error

You're trying to monitor Java metaspace usage with the -XX:+PrintMetaspaceStatistics flag, but getting errors like "Unrecognized VM option" or issues with tty output. This flag helps diagnose class metadata memory issues but has specific requirements.

Introduction

The PrintMetaspaceStatistics flag prints metaspace usage information at garbage collection points. It's useful for diagnosing memory leaks from class loading.

Symptoms

Common error messages include:

bash

# Error
java -XX:+PrintMetaspaceStatistics -version
# Error: Could not create the Java Virtual Machine.
# Error: A fatal exception has occurred. Program will exit.
# Error: Unrecognized VM option 'PrintMetaspaceStatistics'

```bash # For JDK 8 - Use PrintGCDetails instead java -XX:+PrintGCDetails -XX:+PrintGCDateStamps -jar app.jar

# For JDK 11+ - Use unified logging java -Xlog:gc*,metaspace*:file=gc.log:time,level,tags -jar app.jar

# For JDK 16+ - Use specific metaspace logging java -Xlog:metaspace*=info:file=metaspace.log:time -jar app.jar ```

bash

# Error
java -XX:+PrintMetaspaceStatistics -jar app.jar
# [fail] tty not available

Common Causes

Configuration misconfiguration
Missing or incorrect credentials
Network connectivity issues
Version compatibility problems
Resource exhaustion or limits
Permission or access denied

Step-by-Step Fix

1.Check logs for specific error messages
2.Verify configuration settings
3.Test network connectivity
4.Review recent changes
5.Apply corrective action
6.Verify the fix

Common Errors and Solutions

Error 1: Unrecognized VM Option

bash

# Error
java -XX:+PrintMetaspaceStatistics -version
# Error: Could not create the Java Virtual Machine.
# Error: A fatal exception has occurred. Program will exit.
# Error: Unrecognized VM option 'PrintMetaspaceStatistics'

Cause: This flag was removed or renamed in certain JDK versions.

Solution: Use alternative flags based on your JDK version:

```bash # For JDK 8 - Use PrintGCDetails instead java -XX:+PrintGCDetails -XX:+PrintGCDateStamps -jar app.jar

# For JDK 11+ - Use unified logging java -Xlog:gc*,metaspace*:file=gc.log:time,level,tags -jar app.jar

# For JDK 16+ - Use specific metaspace logging java -Xlog:metaspace*=info:file=metaspace.log:time -jar app.jar ```

Error 2: TTY Not Available

bash

# Error
java -XX:+PrintMetaspaceStatistics -jar app.jar
# [fail] tty not available

Cause: The flag requires an interactive terminal for output.

Solution: Redirect output to a file:

```bash # Redirect GC output to file java -XX:+PrintGCDetails -Xloggc:gc.log -jar app.jar

# For JDK 11+ java -Xlog:gc*:file=gc.log:time,level -jar app.jar ```

Error 3: Flag Requires GC Logging

The metaspace statistics only print during GC events:

```bash # Enable GC logging first java -XX:+PrintGCDetails -XX:+PrintMetaspaceStatistics -jar app.jar

# Or trigger GC for statistics jcmd <pid> GC.run ```

Monitoring Metaspace by JDK Version

Java 8

```bash # Enable GC details with metaspace info java -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:gc.log -jar app.jar

# Monitor with jstat jstat -gcmetacapacity <pid> 1000

# Output columns: # MCMN: minimum metaspace capacity # MCMX: maximum metaspace capacity # MC: current metaspace capacity # CCSMN: minimum compressed class space capacity # CCSMX: maximum compressed class space capacity # CCSC: current compressed class space capacity

# Or use jmap jmap -histo <pid> | head -20 ```

Java 11+

```bash # Unified logging for metaspace java -Xlog:gc*,metaspace*:file=gc.log:time,level,tags -jar app.jar

# Or more detailed java -Xlog:metaspace*=debug:file=metaspace.log:time -jar app.jar

# Monitor with jcmd jcmd <pid> VM.metaspace

# Output shows: # - Total allocated # - Total used # - Reserved # - Committed # - By chunk type ```

Java 16+

```bash # Detailed metaspace logging java -Xlog:metaspace*=trace:file=metaspace.log:time -jar app.jar

# NMT (Native Memory Tracking) java -XX:NativeMemoryTracking=summary -jar app.jar

# Check metaspace via NMT jcmd <pid> VM.native_memory summary

# Detailed NMT jcmd <pid> VM.native_memory detail ```

Alternative Monitoring Methods

Using jcmd

```bash # List running Java processes jcmd -l

# Get metaspace info jcmd <pid> VM.metaspace

# Get GC heap info jcmd <pid> GC.heap_info

# Trigger GC and see results jcmd <pid> GC.run jcmd <pid> VM.metaspace ```

Using jstat

```bash # Continuous metaspace monitoring jstat -gc <pid> 1000 10

# Columns include: # M: metaspace used # CCS: compressed class space used

# Metaspace capacity jstat -gcmetacapacity <pid> 1000

# GC cause statistics jstat -gccause <pid> 1000 ```

Using JMX

```java import java.lang.management.ManagementFactory; import java.lang.management.MemoryPoolMXBean;

public class MetaspaceMonitor { public static void main(String[] args) throws InterruptedException { for (MemoryPoolMXBean pool : ManagementFactory.getMemoryPoolMXBeans()) { if (pool.getName().contains("Metaspace")) { System.out.println("Pool: " + pool.getName()); System.out.println("Used: " + pool.getUsage().getUsed() / 1024 / 1024 + " MB"); System.out.println("Committed: " + pool.getUsage().getCommitted() / 1024 / 1024 + " MB"); System.out.println("Max: " + pool.getUsage().getMax() / 1024 / 1024 + " MB"); } } } } ```

Using VisualVM/JConsole

```bash # Start VisualVM jvisualvm

# Or JConsole jconsole

# Navigate to Memory > Metaspace ```

Diagnosing Metaspace Issues

Metaspace OutOfMemoryError

```bash # Error java.lang.OutOfMemoryError: Metaspace

# Check current usage jcmd <pid> VM.metaspace

# Increase metaspace java -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m -jar app.jar

# For Java 8 with compressed class space java -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=512m -XX:CompressedClassSpaceSize=256m -jar app.jar ```

Metaspace Memory Leak

```bash # Enable class unloading java -XX:+CMSClassUnloadingEnabled -XX:+UseConcMarkSweepGC -jar app.jar # Java 8

# For Java 11+, class unloading is enabled by default

# Track class loading java -XX:+TraceClassLoading -XX:+TraceClassUnloading -jar app.jar

# Or with unified logging java -Xlog:class+load,class+unload:file=classes.log -jar app.jar

# Find loaded classes jcmd <pid> VM.classloader_stats jcmd <pid> VM.classloaders ```

Analyzing Metaspace Dump

```bash # Dump class histogram jcmd <pid> GC.class_histogram > class_histogram.txt

# Find duplicate classes grep -E "^[0-9]+:" class_histogram.txt | sort -k3 -n -r | head -20

# Dump heap for analysis jcmd <pid> GC.heap_dump /tmp/heap.hprof

# Analyze with Eclipse MAT or VisualVM ```

Complete Monitoring Setup

Production JVM Options (Java 11+)

bash

java \
  -Xms2g -Xmx2g \
  -XX:MetaspaceSize=256m \
  -XX:MaxMetaspaceSize=512m \
  -Xlog:gc*,metaspace*:file=/var/log/app/gc.log:time,level,tags:filecount=5,filesize=10m \
  -XX:+HeapDumpOnOutOfMemoryError \
  -XX:HeapDumpPath=/var/log/app/heap.hprof \
  -XX:NativeMemoryTracking=summary \
  -jar app.jar

Monitoring Script

```bash #!/bin/bash # metaspace_monitor.sh

PID=$1 LOG_FILE="/var/log/app/metaspace.log"

while true; do TIMESTAMP=$(date '+%Y-%m-%d %H:%M:%S') METASPACE=$(jcmd $PID VM.metaspace 2>/dev/null | grep -A5 "Total Usage" | head -6) echo "[$TIMESTAMP] $METASPACE" >> $LOG_FILE sleep 60 done ```

Prometheus Exporter

yaml

# Add to Prometheus config
scrape_configs:
  - job_name: 'jvm'
    static_configs:
      - targets: ['localhost:8080']

bash

# Run with JMX exporter
java -javaagent:jmx_prometheus_javaagent.jar=8080:config.yaml -jar app.jar

Verification

```bash # Verify metaspace settings java -XX:+PrintFlagsFinal -version | grep Metaspace

# Check current JVM options jcmd <pid> VM.flags

# Test GC logging java -Xlog:gc*:file=gc.log:time -version cat gc.log

# Verify NMT java -XX:NativeMemoryTracking=summary -version ```

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Every guide undergoes technical review for accuracy and is updated when software versions, commands, or best practices change.

Last updated: Apr 27, 2026

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Fix Java PrintMetaspaceStatistics Error

Introduction

Symptoms

Common Causes

Step-by-Step Fix

Common Errors and Solutions

Error 1: Unrecognized VM Option

Error 2: TTY Not Available

Error 3: Flag Requires GC Logging

Monitoring Metaspace by JDK Version

Java 8

Java 11+

Java 16+

Alternative Monitoring Methods

Using jcmd

Using jstat

Using JMX

Using VisualVM/JConsole

Diagnosing Metaspace Issues

Metaspace OutOfMemoryError

Metaspace Memory Leak

Analyzing Metaspace Dump

Complete Monitoring Setup

Production JVM Options (Java 11+)

Monitoring Script

Prometheus Exporter

Verification

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Java Troubleshooting FAQs

FixWikiHub Editorial Team

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Fix Java PrintMetaspaceStatistics Error

Introduction

Symptoms

Common Causes

Step-by-Step Fix

Common Errors and Solutions

Error 1: Unrecognized VM Option

Error 2: TTY Not Available

Error 3: Flag Requires GC Logging

Monitoring Metaspace by JDK Version

Java 8

Java 11+

Java 16+

Alternative Monitoring Methods

Using jcmd

Using jstat

Using JMX

Using VisualVM/JConsole

Diagnosing Metaspace Issues

Metaspace OutOfMemoryError

Metaspace Memory Leak

Analyzing Metaspace Dump

Complete Monitoring Setup

Production JVM Options (Java 11+)

Monitoring Script

Prometheus Exporter

Verification

Related Articles

People also search for

Share this guide

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Java Troubleshooting FAQs

FixWikiHub Editorial Team

Disclaimer & Safety Guidelines

Official Documentation & Further Reading