jstack | Preemptive jstack for production debugging | Hacking library

 by   takipi Java Version: Current License: No License

kandi X-RAY | jstack Summary

kandi X-RAY | jstack Summary

jstack is a Java library typically used in Security, Hacking applications. jstack has no bugs, it has no vulnerabilities and it has high support. However jstack build file is not available. You can download it from GitHub.

Preemptive jstack for production debugging as presented by Tal Weiss from Takipi @ JavaOne '14 SF.

            kandi-support Support

              jstack has a highly active ecosystem.
              It has 80 star(s) with 23 fork(s). There are 17 watchers for this library.
              It had no major release in the last 6 months.
              jstack has no issues reported. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of jstack is current.

            kandi-Quality Quality

              jstack has 0 bugs and 0 code smells.

            kandi-Security Security

              jstack has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              jstack code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              jstack does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              jstack releases are not available. You will need to build from source code and install.
              jstack has no build file. You will be need to create the build yourself to build the component from source.
              jstack saves you 86 person hours of effort in developing the same functionality from scratch.
              It has 220 lines of code, 18 functions and 2 files.
              It has medium code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed jstack and discovered the below as its top functions. This is intended to give you an instant insight into jstack implemented functionality, and help decide if they suit your requirements.
            • Command line
            • Add an environment variable
            • Remove an environment variable
            Get all kandi verified functions for this library.

            jstack Key Features

            No Key Features are available at this moment for jstack.

            jstack Examples and Code Snippets

            DTrace examples
            npmdot img1Lines of Code : 57dot img1no licencesLicense : No License
            copy iconCopy
            dtrace -x strsize=4k -qn 'bunyan*:::log-*{printf("%d: %s: %s", pid, probefunc, copyinstr(arg0))}'
            dtrace -x strsize=4k -qn 'bunyan*:::log-*/strstr(this->str = copyinstr(arg0), "\"component\":\"wuzzle\"") != NULL/{printf("%s", this->str)}'

            Community Discussions


            sql developer sqldeveloper- is crashing - Error 126
            Asked 2022-Jan-05 at 16:16

            sql developer version (sqldeveloper- of sqldeveloper.exe is crashing with this error:



            Answered 2021-Oct-06 at 18:27

            Thank you for your suggestion but I was not allowed to install another version of Java on this machine. This seems to me like a bug and the program should be fixed, not circumventing by adding more software onto your system. It should work out of the box as soon as I download it.

            I have now found a solution, the solution is I will use TOAD for now until Oracle can get their act together.

            Source https://stackoverflow.com/questions/69441654


            Taking Thread dump/ Heap dump of Azure Kubernetes pods
            Asked 2021-Nov-26 at 12:12

            We are running our kafka stream application on Azure kubernetes written in java. We are new to kubernetes. To debug an issue we want to take thread dump of the running pod.

            Below are the steps we are following to take the dump.

            1. Building our application with below docker file.



            Answered 2021-Nov-26 at 12:12

            Since you likely need the thread dump locally, you can bypass creating the file in the pod and just stream it directly to a file on your local computer:

            Source https://stackoverflow.com/questions/70120207


            Installing jenkins on Linux Mint 20.2
            Asked 2021-Nov-26 at 06:56

            I've Linux Mint 20.2 Cinnamon and I tried to install jenkins. Detailed steps for installation is as below:

            1. Installing java - installed via apt



            Answered 2021-Nov-26 at 06:56

            jenkins will work with java 8 on mint 20 and 21. If you have different java versions installed on your system then select the jdk8 as default by

            Source https://stackoverflow.com/questions/70107177


            How to capture application monitoring information from the docker container
            Asked 2021-Aug-31 at 16:20

            I have more than one java application running in separate docker containers. I am trying to collect monitoring data such as GC log, thread dump, heap dump from the java process running inside a container using tools like jstat, jstack, jmap. Is it possible to capture this information from the host(outside containers)?

            I am new to the containerized world. I understand that PID namespace of the host and container is different. When I execute jstack > thread_dump.txt from the host, it shows error message: Unable to open socket file /proc/root/tmp/.java_pid: target process doesn't respond within 10500ms or HotSpot VM not loaded

            Where PID is process id from the host PID namespace.

            When I execute jstack inside container ( docker exec -it ) then it is able to capture thread dump.

            Where PID is process id from the container PID namespace.

            Any hints on how to solve this?



            Answered 2021-Aug-31 at 13:17

            The command you should use is:

            Source https://stackoverflow.com/questions/68999346


            Commands like jps, jstat, jstack, etc show " not found"
            Asked 2021-Jun-02 at 18:08

            I am running Tomcat 9 on an Ubuntu 20.04 OS using OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode). When I try to gather diagnostics info using jstat, jstack, etc, I see PID not found. jps also cannot identify the Tomcat process id.

            I have checked several posts like one, two, three, four, etc, but none of the answers given in these helped me to solve my problem!

            Even though I am passing the username with which the Tomcat process is running, jstat cannot find that process: sudo -u tomcat jstat -gc 476174 5000

            In case it matters:

            1. I can see that the Tomcat process is started with -Djava.io.tmpdir=/tmp This folder is owned by root user but has full permissions(777) enabled.
            2. When the Tomcat process is started, I can see a folder with name systemd-private-e6d8b5dc224848f8a64a3e943ac2e9c4-tomcat9.service-UH5knj (the last few chars after service- change every time the process is restarted) getting created with owner as root (probably because I start tomcat service using sudo service tomcat9 start) and this folder has permission of rwx------.

            Any hints on how to solve this issue?

            Thanks, Shobhana



            Answered 2021-Feb-09 at 20:58

            All these tools (jstack, jmap, jstat...) rely on the communication with the target JVM through /tmp directory.

            Apparently Tomcat runs in a different mount namespace, so that its /tmp directory is not the same as /tmp of the current shell. To verify this, run

            Source https://stackoverflow.com/questions/66100459


            How to Obtain Java Thread Dump in JRE 1.8.0_144
            Asked 2020-Nov-05 at 18:08

            I've been trying to find ways to obtain the Thread Dump from a Java Application on my Windows server running on jre 1.8.0_144.

            Non of the monitoring utilities like jcmd jstack jconsole are available in either the bin or lib folders of the Java environment directory.

            I have come across several applications online that claim to perform the same task but haven't found a reliable one yet.

            Appreciate it anyone has a recommendation or a suggestion. (Changing the JRE version, unfortunately, has been ruled out as an option)



            Answered 2020-Nov-05 at 18:08

            There is a way if you are running with tools.jar available, that is running from a JDK instead of a stock JRE. However given that you don't have the jcmd, jstack, jconsole tools available, this is unlikely.

            Source https://stackoverflow.com/questions/64701081


            How to do a Thread Dump on EMR Presto service
            Asked 2020-Oct-18 at 17:59

            By going to the Amazon EMR summary page, I can only see command for how to connect to the master node with hadoop user:



            Answered 2020-Oct-18 at 17:59

            Apparently Presto service is run as presto OS user. Thus, you need to invoke jstack as that user too.

            For example

            Source https://stackoverflow.com/questions/64398684


            What does the * mean following a filename in Mac terminal
            Asked 2020-Sep-28 at 01:35

            Does anyone know what the * following a filename in macOS terminal means?

            All the file names in the folder:


            have a * trailing them and I'm not sure why.

            For example:



            Answered 2020-Sep-28 at 01:30

            As for the executable-looking emulator that you can't actually execute, this can happen when the dynamic loader requested by emulator doesn't exist. You can check what kind of file emulator is with the command file emulator, and check what dynamic loader and libraries it needs with ldd emulator (any line showing “not found” is something you need to install). Given the name of the directory and the size of the file, emulator is probably a Linux x86 binary. I suspect you have an amd64 system. If so, you need to install a runtime environment for 32-bit applications; on Ubuntu, you need the ia32-libs package (and perhaps also ia32-libs-gtk). You could also get this error message for a script whose interpreter as indicated in the #! line doesn't exist.


            same question here.

            Source https://stackoverflow.com/questions/64094843


            How can I know who call System.gc() in spark streaming program?
            Asked 2020-May-17 at 11:16

            The GC time is too long in my spark streaming programme. In the GC log, I found that Someone called System.gc() in the programme. I do not call System.gc() in my code. So the caller should be the api I used.

            I add -XX:-DisableExplicitGC to JVM and fix this problem. However, I want to know who call the System.gc().

            I tried some methods.

            1. Use jstack. But the GC is not so frequent, it is difficult to dump the thread that call the method.
            2. I add trigger that add thread dump when invoke method java.lang.System.gc() in JProfiler. But it doesn't seem to work.

            How can I know who call System.gc() in spark streaming program?



            Answered 2020-May-17 at 11:16

            You will not catch System.gc with jstack, because during stop-the-world pauses JVM does not accept connections from Dynamic Attach tools, including jstack, jmap, jcmd and similar.

            It's possible to trace System.gc callers with async-profiler:

            1. Start profiling beforehand:

            Source https://stackoverflow.com/questions/61849214

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install jstack

            You can download it from GitHub.
            You can use jstack like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the jstack component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            gh repo clone takipi/jstack

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