I am trying to take heap dump using below 2 commands jcmd $pid GC.heap_dump /tmp/filename.dump jmap -dump:format=b,file=/tmp/filename.dump $pid jcmd produces file size of ~300M and jmap produces file size of ~1.4G. why these are different sizes, do we have any additional information in jmap ? am I missing some arguments in jcmd ? JDK is 1.8.0_162 Xms and Xmx is
Spring boot where is my jar file
Spring boot makes it really easy to setup a simple app. But it takes me longer to actually get a jar file which I can upload to a remote server. I am using IntelliJ, no command line, and I use gradle. The application is running somehow out of Intellij. But where are the created files? Where is my jar from
Are Promises in JavaScript like Exception Handling in Java?
Just like the try(), catch() and throw() in Java as an exception handling is like then() and catch() in JavaScript as a promise!? Just a beginner asking some questions. Please don’t judge. xD Answer try/catch detect the error itself and transfer control to catch part. this syntax exists in js too. but in then/catch, you must notify occurring an error
Exception in thread “main” java.lang.NoSuchMethodError: com.google.common.base.Preconditions.checkState(ZLjava/lang/String;Ljava/lang/Object;)
I develop the selenium code that: I’m getting the error that is: I’m trying to solve this issue according to This Solution by upgrading guava-21.0. But I’m still getting this error. could anyone give a solution to solve it? Answer This error message… …implies that the JVM was unable to initiate/spawn your program. As @GhostCat pointed your main issue is
Maven Checkstyle Plugin doesn’t fail during build even though `failsOnError` is set to `true`
My project enforces strict style so I have the maven-checkstyle-plugin running as part of my build. When I run the build, I see the plugin running and checking style but it should fail when there are checkstyle issues since I have the true flag set. Any reason it keeps going and the build succeeds? Answer Read the log: Those are
Not able to add JPA dependency into spring-boot project
I am trying to add JPA Maven dependency to already created spring-boot project but I am getting following error: When I remove it the error is gone. pom.xml application.properties I tried to find answer online but none was solution for me. Also tried to create > Spring starter project > an there immediately add JPA, Web and H2 but still
Missing iFrame view for Javadocs JDK 11+
I’ve been using the JavaDocs for JDK 11 But I’ve noticed that the iFrames view appears no longer to be available. I’ve looked around, but can’t see any details on why this has been done, and what the alternatives are if any? Can anyone provide more detail? View for JDK 10 View for JDK 11 Answer In case anyone else
Spring boot – @Service class calling another @Service class
Is it fine to have a @Service annotated class calling another @Service annotated class? Or it is a bad practice? Eg.: Answer It is not any restriction calling a service from another one. Unless you make circular dependency between services. Circular dependency : https://en.wikipedia.org/wiki/Circular_dependency Circular dependency in spring : https://www.baeldung.com/circular-dependencies-in-spring
How to return the file path from the windows file explorer using Java
In my Project, I want to open the windows file explorer with java, in which you can select a file or a folder and click the “OK” button. Now I want to have the path of the selected file in my Javacode. Basically like the window which pops up in every standard texteditor after you hit the “OPEN” button to
LDAPS : Simple bind failed
I’m facing issue connecting to LDAPS from my application. I have imported all necessary certificates on JRE keystore. I’m able to make calls to LDAPs when I put the following string in java.security When I change this line to my connection fails with following error: In wireshark it complains about certificate invalid.My question is if my certificate is invalid, it