Interviewers often judge your experience with debugging skills. For example, debugging jar hell issues, debugging SSL issues, debugging hibernate issues, debugging transaction management issues, etc. All these are covered in detail under the key areas “
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Q1. How would you go about debugging thread-safety or concurrency issues? A1. #1: Manually reviewing the code for any obvious thread-safety issues. … Read more ›...
The JAR hell issues also lead to exceptions like NoSuchMethodError or IllegalArgumentException. I have already discussed debugging JAR Hell issues. #1 Check the war file for any duplicate versions of...
The following 3 questions are frequently asked by Java developers as an industrial strength Java project will have 100+ jar files. How often have you come across a Java application that requires different versions of the same library?
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1. Error: Unsupported major.minor version 51.0 error?
What does this error mean?
The above error means what version of the JRE that the class file is compatible with.
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Often you get to work on a fully functional Java application that is already in production to fix production issues or to enhance its existing functionality. As a new Java developer in the team,
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What is a LinkageError in Java?
A jar that is being loaded by two different classloaders can throw a java.lang.LinkageError. For example, your application server (e.g JBoss) on startup loads that jar or has a directory with that jar.
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The javap is a class file dissembler. Here are 3 scenarios you can put javap to use with code examples.
#1 Finding the Java version of the class file within a jar
Extract a class file say “MyJobRunner.class”
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This is another debugging concurrency issues tutorial following on Debugging Java thread-safety, multi-threading, or concurrency issues tutorial. Step 1: Java code that creates a dead lock situation by a) thread-0...
This extends JConsole for debugging deadlocks in Java applications, using jvisualvm that gets shipped with your JDK. Step 1: Java code that creates a dead lock situation by a) thread-0...
