So I would like to build my maven project with
mvn clean package
But once I try to run my built jar file in target folder like
java -jar app-1.0-SNAPSHOT.jar
It shows error:
Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: net/sourceforge/jdatepicker/DateModel at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: net.sourceforge.jdatepicker.DateModel at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more
Pom DataPicker dependency:
<!-- https://mvnrepository.com/artifact/net.sourceforge.jdatepicker/jdatepicker -->
<dependency>
<groupId>net.sourceforge.jdatepicker</groupId>
<artifactId>jdatepicker</artifactId>
<version>1.3.2</version>
</dependency>
Why even though dependency was added, exception occurs?
try delete and redownload the jar in your local maven repo.
If your are using idea, try update local repo in the maven setting.
You need to ensure all your dependencies are available to java runtime by adding them to your classpath. Adding a dependency in pom will help only in compiling and packaging the project.
try adding maven plugin so that it copies all your dependencies with the jar file and it does not have to look any further. Do this by adding:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals><goal>copy-dependencies</goal></goals>
</execution>
</executions>
</plugin>