Software⏱️ 3 min read📅 2026-06-19

How to Fix: Error In centos6 while compiling java classes,in tomcat6

Error In centos6 while compiling java classes,in tomcat6: Insufficient memory for Java Runtime Environment to continue.

Quick Answer: Increase the stack size limit using 'ulimit -s' command or add '-Xss' option when running the javac command.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 🎯 Final Words

Error In centos6 while compilingjava classes,in tomcat6

This error occurs when the Java compiler is not found in the system's PATH, causing the bash: javac: command not found error. It affects users who are new to Linux and Centos6 and are trying to compile their servlet classes.

💡 Why You Are Getting This Error

  • The first main reason why this error happens is that the Java compiler (javac) is not in the system's PATH. This can be due to a variety of reasons, such as the JVM installation location being different from the expected one or the javac executable being missing.
  • Another possible cause could be the lack of sufficient memory for the Java Runtime Environment to continue, resulting in an OutOfMemoryError: unable to create new native thread.

🛠️ Step-by-Step Verified Fixes

Resolving the 'bash: javac: command not found' error

  1. Step 1: Step 1: Check if the JVM is installed correctly and the expected location of the javac executable is correct. The default location for Java in Centos6 is /usr/lib/jvm/java-1.6.0/
  2. Step 2: Step 2: Verify that the javac executable exists at this location by checking the file system or running the command 'ls /usr/lib/jvm/java-1.6.0/bin' to see if it's there.
  3. Step 3: Step 3: If thejavac executable is present, try compiling a simple Java program using the command './javac' in the terminal to check for any issues with the javac command itself.

Resolving the OutOfMemoryError: unable to create new native thread

  1. Step 1: Step 1: Check the current ulimit settings using the command 'ulimit -a' to see if there are any limits on memory usage.
  2. Step 2: Step 2: Increase the limit for maximum locked memory and max memory size to a higher value. For example, add the following lines to /etc/security/limits.conf and reboot the system to apply the changes: soft nofiles -1 hard nofiles -1 soft nproc -1 hard nproc -1
  3. Step 3: Step 3: Check the current top process to see if any process is consuming excessive memory. If so, consider killing the process or increasing the available memory.

🎯 Final Words

To resolve this error, first check if the Java compiler (javac) is in the system's PATH and verify that it exists at the expected location. Additionally, increase the limit for maximum locked memory and max memory size to a higher value if necessary. If you're still experiencing issues after following these steps, consider checking the current top process to see if any process is consuming excessive memory.

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