A JNI error has occurred please check your installation and try again in Eclipse x86 Windows 8 1

Question

public class LoginCumReg implements ActionListener KeyListener           private JFrame form          private JTextField txtunm          private JTextField txtnm          private JTextField txteml          private JButton cmdcreate          private JPasswordField txtpass          private JPasswordField txtpassreg          private JButton cmdok          private JLabel lblunm          private JLabel lblpass          private JLabel lbleml          private JLabel lblpassreg          private JLabel lblnm          private JPanel panel 1      public LoginCumReg                construct components         form   new JFrame  quot Sign Up quot            form getContentPane   setFont                  new Font  quot Plantagenet Cherokee quot   Font BOLD  18            txtunm   new JTextField 5           txtunm addKeyListener this           txtunm setBounds 637  55  100  25           txtnm   new JTextField 5           txtnm setBounds 637  228  100  25           txteml   new JTextField 5           txteml setBounds 637  264  100  25           cmdcreate   new JButton  quot Create Account quot            cmdcreate setBounds 527  350  188  25           txtpass   new JPasswordField 5           txtpass setBounds 637  91  100  25           txtpassreg   new JPasswordField 5           txtpassreg setBounds 637  300  100  25           cmdok   new JButton  quot OK quot            cmdok setBounds 527  139  100  25           lblunm   new JLabel  quot UserName quot            lblunm setBounds 527  55  73  25           lblpass   new JLabel  quot Password quot            lblpass setBounds 527  91  100  25           lbleml   new JLabel  quot Email ID quot            lbleml setBounds 527  264  100  25           lblpassreg   new JLabel  quot Password quot            lblpassreg setBounds 527  300  100  25           lblnm   new JLabel  quot Full Name quot            lblnm setBounds 527  228  100  25               form setResizable false               adjust size and set layout         form setPreferredSize new Dimension 800  450             form setDefaultCloseOperation JFrame EXIT ON CLOSE           form getContentPane   setLayout null               add components         form getContentPane   add txtunm           form getContentPane   add txtnm           form getContentPane   add txteml           form getContentPane   add cmdcreate           form getContentPane   add txtpass           form getContentPane   add txtpassreg           form getContentPane   add cmdok           form getContentPane   add lblunm           form getContentPane   add lblpass           form getContentPane   add lbleml           form getContentPane   add lblpassreg           form getContentPane   add lblnm            cmdcreate setActionCommand  quot Create Account quot            cmdcreate addActionListener this           cmdok setActionCommand  quot Login quot             JPanel panel   new JPanel            panel setBounds 502  29  254  154           panel setFont new Font  quot Palatino Linotype quot   Font PLAIN  14            panel setBorder new TitledBorder new EtchedBorder EtchedBorder RAISED                  null  null    quot LOGIN quot   TitledBorder LEADING  TitledBorder TOP                  null  null            panel setBackground SystemColor controlHighlight           form getContentPane   add panel            panel 1   new JPanel            panel 1 setBounds 500  204  254  186           panel 1 setFont new Font  quot Palatino Linotype quot   Font PLAIN  14            panel 1 setBorder new TitledBorder new EtchedBorder                  EtchedBorder RAISED  null  null    quot SIGN UP quot                   TitledBorder LEADING  TitledBorder TOP  null  null            panel 1 setBackground SystemColor controlHighlight           form getContentPane   add panel 1            JLabel lblNewLabel   new JLabel  quot New label quot            lblNewLabel setBounds 91  139  286  101           lblNewLabel setIcon new ImageIcon                   quot C   Users  JAsh  Desktop  Projects  JAsh png quot             form getContentPane   add lblNewLabel            JPanel panel 2   new JPanel            panel 2 setBounds 77  118  315  145           panel 2 setBorder new EtchedBorder EtchedBorder RAISED                  SystemColor activeCaptionBorder  SystemColor menu            panel 2 setBackground SystemColor controlHighlight           form getContentPane   add panel 2           cmdok addActionListener this            form setResizable false           form pack            form setVisible true           System out println  quot const   quot               public static void main String   args            new LoginCumReg                Override     public void actionPerformed ActionEvent ae               TODO Auto-generated method stub          if  ae getActionCommand   equals  quot Create Account quot                  new Registration txtnm getText    txteml getText    new String                      txtpassreg getPassword                  form setVisible false                      if  ae getActionCommand   equals  quot Login quot                  try                   if  txtunm getText   equalsIgnoreCase  quot admin quot                            amp  amp  new String txtpass getPassword    equals  quot admin quot                          form setVisible false                       new Admin                      else                       DataBase db   new DataBase                        db connect                        String sql    quot SELECT   FROM LOGIN WHERE USERNAME   quot                                txtunm getText      quot   quot                       ResultSet rs   db getDDL sql                       boolean found   false                      while  rs next                              if  rs getString  quot Password quot   equals                                  new String txtpass getPassword                                    found   true                              form setVisible false                               String name   rs getString  quot FullName quot                                Session startSession txtunm getText    name                               new FacultyWelcome                                                                        if   found                          JOptionPane showMessageDialog new JFrame                                     quot Invalid Credentials quot                        db close                                    catch  Exception e                                         Override     public void keyPressed KeyEvent arg0               TODO Auto-generated method stub             Override     public void keyReleased KeyEvent arg0               TODO Auto-generated method stub              Override     public void keyTyped KeyEvent arg0               TODO Auto-generated method stub         JOptionPane showMessageDialog new JFrame    arg0 getKeyChar    quot - quot  arg0 getKeyCode               The above code works perfectly on my friend s laptop and throws this error on my laptop  I have running the code on Eclipse Juno using Java 7  I have also tested and run a lot java programs on my laptop all works well  This is the only program which gives such an error  This is my final year project and I need it to work on my laptop  I will be greatful to anyone who helps

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My issue came from trying to disable the Maven nature from my project and then deleting the pom.xml file. This is bad, very bad, don't do this. If you do, change it back to a Maven project and hopefully you can either restore your old pom.xml file or create a new one. As soon as I did that, it worked again.

EDIT: I recently ran across this problem again and this time it was because I had duplicate libraries in my classpath. The one Maven added (which started with /M2_REPO/.... and then one I had added (which I should not have done). Even though Eclipse was reporting that it could not find the class, the actual problem was that I had given it two libraries with the same class and it didn't know which one to use. Once I removed the second reference, it worked.

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The programs which has been written on one version of jdk won t support the JNI platform of another version of jdk  If in case we are using jdk10 and jdk8 eclipse configured for jdk10 and code written on jdk10  Now  i don t want to use jdk10 and started using jdk8 as jvm and tried to run the code which is written on jdk10  so eclipse will through error of JNI  So  to come out of this error  please add the current JVM path to eclipse ini file  after this copy the written code to clipboard and delete the project in eclipse and create new project and check in copied code and run

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I think this happen because the name of your class is the same name of another class in the JDK   Help eclipse to determine which one you are trying to run by selecting the package your class is in   Go to run configuration select the project and the main class   When you press the search button to select the main class  you will find options that have the same name but different package  select your class

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I experienced the same issue  however in my case it was due to the Configuration settings in IntelliJ IDEA   Even though the project SDK  File -  Project Structure  was set to Java 11  the JRE in the Run Debug Configurations  Run -  Edit Configurations  was set to Java 8   After changing that to Java 11  it worked like a charm

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If the problem occurs while lanching an ANT  check your ANT HOME  it must point to the same eclipse folder you are running   It happened to me while I reinstalled a new eclipse version and deleted previouis eclipse fodler while keeping the previous ant home  ant simply did not find any java library   This in this case the reason is not a bad JDK version

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I have been having this problem for a while  but now I have figured it out   It turns out that Java JDK 12 have both the JRE and the JDK inside the bin folder of the Java 12 JDK   I have always believed that JRE and JDK are different application  but it turns out things have changed   My problem was that I had Java JDK 12 installed on my computer  At the same time  I had Java 8  JRE  Installed on my computer    So my computer is getting confused    With my command prompt environment setup to run Java and Javac commands   I typed the follow commands    java -version         this gave me Java 8  After that  I typed   javac -version      this gave me Java 12  In other words  my program is getting compiled with Java 12 and I am trying to run with Java 8   To solve the problem  I uninstalled Java 8 JRE from my computer    Went back to command prompt to check if  java -version  and  javac -version  is returning the same version number  and yes  it is returning Java 12    Tried recompiling my program again  and running it  It Worked    It worked  Eureka

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had the same issue   I had imported a newer version of json library  deleted the old one - but not removed it from the build path   Resolved it by removing the reference to the old one from the build path

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You can try  right click on the project and then click clean  After this run the project   It works for me

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POSSIBLE SOLUTION If NONE of these solutions worked for you then try this    I finally got mine working by deleting the two folders   metadata   amp    recommenders  in the workspace folder  You can find your workspace folder path by clicking on  File   Switch Workspace   Other  in the Eclipse application s toolbar   Now I am a complete noob crying my way through an SE degree at San Jose State University  So I am just sharing what worked for me without knowing much knowledge of why exactly  I do not know what harm or headaches  or even if both aforementioned folders needed to be deleted  But in the end  it worked for me and it seems the application just recreates fresh versions of those folders anyways

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I was facing the same issue and in my case compiler compliance level was selected as 14 in my eclipse settings  In order to fix it  I changed it to the version of JDK on my machine i e 1 8 and recompiled the project

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When we get this error while running our java application  check if we have some class name or package names starting with    java      if so change the package name  This is happening because your package name is colliding with java system file names

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I faced a similar problem and than got the solution in the package name  I kept the package name as java basics  In the console I got a hint for that as it clearly said Prohibited package name  So I changed package name and it worked

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Hi I faced similar problem with a project  in IntelliJ with Maven dependencies   I solved it changing the dependencies scope from provided to compile    IntelliJ      File   project structure   Modules   Dependencies   scope  provide to   compile

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Running the jar from command line by   C  folder where jar stored gt java -jar JarName jar   I got information which made the problem clearer      main Main has been compiled by a more recent version of the Java   Runtime     In this case jar was compiled with version newer than jre supports

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I solved it changing my  Compiler compliance level    In Eclipse   Window -  Preferences -  Java -  Compiler

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Check your console  It says java lang SecurityException issue  Change your  package name   I changed my package name from  java assessment  to  assesment  and it worked for me   If somebody knows the root cause   let me know please

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In my case the issue was caused by the JDK version  To solve this I suggest to go into your pom file and check the  lt jdk version gt 1 7 lt  jdk version gt     Afterwards check java version in your cmd windows  or terminal   OSX or LINUX   by typing   java -version   Compare the version shown in the terminal command prompt with what you have in your pom file  Make sure they are the same  Then run your project again

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Faced the same issue in Netbeans 8 0 2  Clean and Build Project solved this problem

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Using gradle the following also worked for me   Package Explorer -  Right Click project -  Gradle -  Refresh Gradle Project

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It can happen if the JDK version is different   try this with maven    lt properties gt       lt jdk version gt 1 8 lt  jdk version gt   lt  properties gt    under build- plugins    lt plugin gt        lt groupId gt org apache maven plugins lt  groupId gt       lt artifactId gt maven-compiler-plugin lt  artifactId gt       lt version gt 2 3 2 lt  version gt       lt configuration gt           lt source gt   jdk version  lt  source gt           lt target gt   jdk version  lt  target gt       lt  configuration gt    lt  plugin gt

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In my case  Eclipse was giving me this error but I was getting classnotfoundexception on javax servlet http HttpServletin the logs    In my case  I was trying to start a spring boot app with exclude module   spring-boot-starter-tomcat  in my build gradle  since I m deploying on Wildfly      The solution was to comment this exclude out   The eclipse JNI error was very misleading and I would suggest fixing this

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I have been running into the same error when I add the following maven dependency in my project    lt artifactId gt aws-encryption-sdk-java lt  artifactId gt    The error came up only when I ran the shade jar file produced by maven-shade-plugin  I was able to overcome the error by using the jar produced by maven-assembly-plugin

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edit the   classpath  and include below tag   lt classpathentry kind  con  path  org testng TESTNG CONTAINER   gt   this could solve your problem

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I also faced the same issue  By looking at the console that s saying     java lang SecurityException issue    the Solution is      Check your package name of your project    Hope your issue will be resolved  If not  then please print your console trace for tracking the root cause

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You can check the console first to see the actual error message then proceed by looking for answers for that error    My console shows the error NoClassDefFound for the class jcommander  Your error will probably be different from mine  The cause of my error is that the class jcommander is not in my M2 repository  so I just have to add that dependency in my pom xml  You can check if all the class dependencies are all declared and added in your current config and project build   NoClassDefFoundError

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In Netbeans 8 0 2    Right click on your package  Select  Properties   Go to  Run  option  Select main class by browsing your class name  Click the  Ok  button

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There was no information in my Console so that sent me searching for additional solutions and found these - unique to the solutions presented here   I encountered this with Eclipse Oxygen trying to run an old Ant build on a project   Cause 1 I had configured Eclipse to use an external Ant install which was version 1 10 2 which apparently had classes in it that were compiled with JDK 9   In Eclipse I got the JNI error described above  running the Ant build at the command line gave me the reknowned  unsupported major minor version  error - the Java I was using on the system was JDK 8    The solution was to rollback to the embedded Eclipse version of Ant being 1 10 1   I verified this as the correct solution by downloading Ant 1 10 1 separately and reconfiguring Eclipse to use the new 1 10 1 externally and it still worked   Cause 2 This can also happen when you have the Ant Runtime settings configured incorrectly in Eclipse s Preferences   Depending on the version of Ant you re running you will need to add the tools jar from the appropriate JDK to the classpath used for the Ant Runtime  Home Entries    More specifically  without a proper configuration  Eclipse will complain when launching an Ant target that the JRE version is less than a particular required version   Essentially   proper configuration  means aligning each of the configuration items in Eclipse for running Ant so that they all work together   This involves the Ant Runtime Home entry  must point to an Ant version that is compatible with your chosen JDK -- you can t run Ant with JDK 8 when it was compiled against JDK 9   specifying the tools jar that belongs to the JDK you want to run Ant with in the Ant Runtime settings  and lastly setting the JRE environment of your build script to the JDK you want to run Ant with in the External Tools Configuration   All 3 of these settings need to agree to avoid the error described above   You ll also need to consider the attributes used in your javac tag to ensure the JDK you re using is capable of executing as you ve directed  i e  JDK 7 can t compile code using source and target version 8    Moreover If you re really just trying to run an Ant build script to compile code to an older JDK  e g  less than 8 for Oxygen   this article helped gain access to run Ant against an older JDK   There are Ant plugin replacements for a handful of versions of Eclipse  the instructions are brief and getting the correct plugin version for your particular Eclipse is important   Or more simply you can use this very good solution to do your legacy compile which doesn t require replacing your Eclipse plugin but instead changing the javac tag in your build script  while using the latest JDK

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I have faced the same issue due to packaged name was  Java  after rename package name it was not throwing an error

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I had similar issues when using  java  at the beginning of the package name  e g  java jem pc  Check your console output  I was receiving    Exception in thread  main  java lang SecurityException  Prohibited package name  java jem pc

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Short answer  Right-click on the class that contains the main method  Click on  Run As   Click on  Java Application   The keyboard shortcut is  Shift Alt X J  while holding Shift and Alt  press X  then release Shift and Alt and press J    Long answer  To be honest  I am not 100  sure why this problem happens  It might be because of using a different jdk   I faced the same error  The solution was easier than I imagined   I was used to running my code using Ctrl   F11  But when I ran it as a java application  the way I described in  short answer    the problem was resolved  I am not sure if it solves other people s problems as well  but it is worthwhile to try

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I have found that adding these lines of code to the pom xml file of the maven project solves similar issues for me -   lt build gt       lt plugins gt           lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-jar-plugin lt  artifactId gt               lt configuration gt                   lt archive gt                       lt manifest gt                           lt mainClass gt com packagename MainClassName lt  mainClass gt                       lt  manifest gt                   lt  archive gt               lt  configuration gt           lt  plugin gt            lt plugin gt               lt groupId gt org apache maven plugins lt  groupId gt               lt artifactId gt maven-shade-plugin lt  artifactId gt               lt version gt 2 3 lt  version gt               lt configuration gt                   lt createDependencyReducedPom gt false lt  createDependencyReducedPom gt               lt  configuration gt               lt executions gt                   lt execution gt                       lt phase gt package lt  phase gt                       lt goals gt                           lt goal gt shade lt  goal gt                       lt  goals gt                   lt  execution gt               lt  executions gt           lt  plugin gt       lt  plugins gt   lt  build gt

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Error  A JNI error has occurred  please check your installation and try again in Eclipse   Solution  Check your package name as it may be colliding with the package name in java  Simply change the package name to resolve your issue

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The accepted answer did not resolve the issue  hence posting what worked for me  Error Issue  While trying to run my application as a Java application or as a Spring boot application  I am getting below error A JNI error has occurred  please check your installation and try again   A Java exception has occured  as well as getting this error on console Exception in thread  quot main quot  java lang UnsupportedClassVersionError  com example demo IocApplication has been compiled by a more recent version of the Java Runtime  class file version 55 0   this version of the Java Runtime only recognizes class file versions up to 52 0 What is the Root cause  The reason for this error is that  the Code is getting compiled on a higher version  in my case  it is version 11   and the code is getting executed on a lower version  in my case it is version 8  ie  Java JDK  compiled code on 11    where as JRE    version is 8   Where did I configure JDK 11 and JRE 8    I am using SpringToolSuite  STS   When I created the project  the JRE System library in the build path  which got added is the default JRE library version of 8   1 8  But When I go to Project - gt  properties - gt  Java Compiler - gt  Compiler Compliance Level  it is by default having a selected version of 11  Solution  Project - gt  properties - gt  Java Compiler - gt  Compiler Compliance Level  Set the Compiler Compliance Level to 1 8 That s it  Now you are compiling your code in 1 8 and executing the compiled code with a JRE 1 8

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All is not work for me but Once I delete the    metadata   amp    recommenders  of workspace and also delete the  bin  and  setting  folder and then after I re-import the same project then It worked for me

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I hope this helps somebody else   I was suffering with this while working on a project a few years ago and then a job in a newer project started failing a few days ago   I found this post and was trying to recollect what I had modified in my project and then I remembered that I had changed my maven pom and removed the entry for maven-jar-plugin   When you build a jar whose purpose is to be executable  you need to include this so that certain entries get written into the manifest   I opened the old project  copied that entry  with some modifications for project name  and it worked

[java] A JNI error has occurred, please check your installation and try again in Eclipse x86 Windows 8.1

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