Develop Reference

Mac JDK11: Exception in thread "main" java.lang.NoClassDefFoundError: java/sql/SQLException

New to Java here. Using IntelliJ. I wrote a simple "helloworld" Spring application that compiles just fine, but when I run it receive the following error:
/Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home/bin/java "-javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=51884:/Applications/IntelliJ IDEA.app/Contents/bin" -Dfile.encoding=UTF-8 -p /Users/winston.kotzan/Development/java-spring-helloworld/bin:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-aop-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-aspects-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-beans-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-context-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-context-indexer-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-context-support-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-core-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-expression-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-instrument-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-jcl-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-jdbc-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-jms-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-messaging-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-orm-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-oxm-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-test-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-tx-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-web-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-webflux-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-webmvc-5.1.3.RELEASE.jar:/Users/winston.kotzan/java/spring-framework-5.1.3/libs/spring-websocket-5.1.3.RELEASE.jar -m SpringHelloWorld/com.wakproductions.MainApp
Exception in thread "main" java.lang.NoClassDefFoundError: java/sql/SQLException
at spring.core#5.1.3.RELEASE/org.springframework.core.Constants.<init>(Constants.java:67)
at spring.beans#5.1.3.RELEASE/org.springframework.beans.factory.xml.XmlBeanDefinitionReader.<clinit>(XmlBeanDefinitionReader.java:102)
at spring.context#5.1.3.RELEASE/org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:83)
at spring.context#5.1.3.RELEASE/org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:133)
at spring.context#5.1.3.RELEASE/org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:622)
at spring.context#5.1.3.RELEASE/org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:518)
at spring.context#5.1.3.RELEASE/org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at spring.context#5.1.3.RELEASE/org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at SpringHelloWorld/com.wakproductions.MainApp.main(MainApp.java:8)
Caused by: java.lang.ClassNotFoundException: java.sql.SQLException
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 9 more
I suspect that it may have to do with the CLASSPATH. I tried setting the CLASSPATH environment variable, as well as adding this to the java command
-cp /Library/Java/JavaVirtualMachines/jdk-11.0.1.jdk/Contents/Home
But that does not seem to work. Might I have the incorrect CLASSPATH?

The comments about the module-info file led me to some clues. I took notice that IntelliJ seems to have created a module-info.java file with the following contents:
module SpringHelloWorld {
requires spring.context;
}
Did not realizing I was compiling a module. I deleted that file along with everything in the bin directory. Then I was able to run it by the Run menu using this option:
I can run it on the command line via:
java -Dfile.encoding=UTF-8 -classpath /Users/.../java-spring-helloworld/bin:/Users/.../<spring-framework-libs>... com.wakproductions.MainApp

Java SQLite org.sqlite.JDBC classpath broken?

I stumbled upon a weird error while using JDBC sqlite with org.sqlite.JDBC
my code compiles and runs fine on Windows.
But when I tried moving it to Ubuntu it started showing this:
Exception in thread "main" java.lang.ClassNotFoundException: org.sqlite.JDBC
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:259)
at mall.SQLiteJDBC.<init>(SQLiteJDBC.java:27)
at mall.AllegroReader.<init>(AllegroReader.java:33)
at mall.Mall.main(Mall.java:31)
I'm running it with java -classpath "sqlite-jdbc-3.7.2.jar" -jar Mall.jar" and java -classpath "sqlite-jdbc4-3.8.2-SNAPSHOT.jar" -jar Mall.jar
with both versions in the same directory as my jar and I've tried a dozen different options specifying classpath and it behaves exactly the same. I tried openjdk and oracle jdk.
I tried rebuilding it on Ubuntu, changing ant .xmls, changing paths, etc.
I have no idea what is going on. Pls help.
Here is what happens inside my dist directory:
work1#workwork:/var/www/mall/dist$ ls
mall.db Mall.jar Mall.jar.old sqlite-jdbc-3.8.4.3-SNAPSHOT.jar
work1#workwork:/var/www/mall/dist$ java -classpath "sqlite-jdbc-3.8.4.3-SNAPSHOT.jar:Mall.jar" Mall
Error: Could not find or load main class Mall

The classpath is ignored when you use -jar.
You have to either include the dependencies in the jar (or at least have the jar manifest point to them), or run it with -classpath sqlite.jar:Mall.jar the.main.class.
Error: Could not find or load main class Mall.main. all files are there,
my main class comes from Mall.java and is in mall package which
compiles to Mall.jar
So the correct command line is:
java -classpath "sqlite-jdbc-3.8.4.3-SNAPSHOT.jar:Mall.jar" mall.Mall
OP findings
to view the classes in jar use jar tf Mall.jar - from this I got mall/Mall.class meaning my class containing main was mall.Mall
it showed
mall/Mall.class
so I should have used mall.Mall as the class to run (instead of pulling my hair)

After spending over 6 hours total with many failed attempts at running "portable" jar package using classpath and whatnot, after having tried OneJar and jarjar to no avail (ended up with Class file too large!) I decided to write the offending piece of code in PHP.
It proved to be more portable than Java in my case.

java.lang.NoClassDefFoundError at Runtime: Need Class not on Classpath

I have tried several approaches as suggested on this website as well as several others to no avail.
-Running Angstrom embedded Linux, OpenJDK6, Shark VM.
File Structure
All .java and .jar files are stored in directory ./src
jarfiles: j1.jar j2.jar
Source code: Coder.java, WrapperClass.java
Compiling and Running
javac -cp j1.jar:j2.jar Coder.java WrapperClass.java
Successfully compiles, outputs Coder.class, WrapperClass.class, as well as several other files including Coder$1.class through Coder$6.class, as well as Coder$Main_thread.class and Coder$Progress_Bar_Thread.class, any insight onto what all these .class files are for?
Run attempts all terminate in java.lang.ClassNotFoundException.
~/coder/src: java Package.Coder
~/coder/src: java -cp jar1.jar:jar2.jar Package.Coder
~/coder: java ./src/Package.Coder
~/coder: java -cp jar1.jar:jar2.jar ./src/Package.Coder
Thank you very much for your help. I have run this on NetBeans and can verify that it's functional code, just a matter of getting it to run on Linux.
Stacktrace is:
Exception in thread "main" java.lang.NoClassDefFoundError: Package/Coder Caused by: java.lang.ClassNotFoundException: Package.Coder
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
Could not find the main class: Package.Coder. Program will exit

Assuming this structure
/coder
/src
/Package
/Coder.java
/WrapperClass.java
/j1.jar
/j2.jar
You will need to compile from /src as
javac -cp j1.jar:j2.jar Package/Coder.java Package/WrapperClass.java
This will create .class files in /Package. You can then run it, again from /src as
java -cp j1.jar:j2.jar Package.Coder
assuming the Coder class has a main method which is your entry point.

Compile error with JOGL

I try to compile a simple Java program with JOGL OpenGL, from the command line. In the Eclipse all works fine, when I compile it from the command line with javac I get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: javax/media/opengl/GLEventListener
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
...
Caused by: java.lang.ClassNotFoundException: javax.media.opengl.GLEventListener
...
Could not find the main class: SimpleScene. Program will exit.
I already add to -classpath all the .jar files I find in JOGL directory. The Makefile to build the program is the following:
SimpleScene:
javac -Xlint:deprecation -classpath \
$(jogl)/joal.jar:\
$(jogl)/jogl.os.x11.jar:\
...
$(jogl)/nativewindow.awt.jar:\
$(jogl)/jogl_cg-natives-linux-i586.jar:. \
SimpleScene.java

I had a similar problem and figured out my simple mistake. GLEventListenere is an interface; not a class.
http://download.java.net/media/jogl/builds/archive/jsr-231-beta5/javadoc_public/javax/media/opengl/GLEventListener.html
I fixed my problem after realizing this because my code that uses GLEventListener should use the keyword 'implements' instead of 'extends'.

Jythonc : How to use?

I am new to jython. Here is my failed attempt to use javac to complie my python script into class file.
rohit#rohit-laptop:~/backyard$ echo "print 'hi'" > test.py
rohit#rohit-laptop:~/backyard$ jython test.py
hi
rohit#rohit-laptop:~/backyard$ jythonc test.py
Warning: jythonc is unmaintained and will not be included in Jython-2.3. See http://jython.org/Project/jythonc.html for alternatives to jythonc. Add '-i' to your invocation of jythonc to turn off this warning
processing test
Required packages:
Creating adapters:
Creating .java files:
test module
Compiling .java to .class...
Compiling with args: ['/usr/bin/javac', '-classpath', '/usr/share/java/jython.jar:/usr/share/java/servlet-api-2.4.jar:/usr/share/java/libreadline-java.jar:./jpywork::/usr/share/jython/Tools/jythonc:/usr/share/jython/Lib:/usr/lib/site-python:__classpath__', './jpywork/test.java']
0
rohit#rohit-laptop:~/backyard$
rohit#rohit-laptop:~/backyard$ cd jpywork/
rohit#rohit-laptop:~/backyard/jpywork$ ls
test.class test.java test$_PyInner.class
rohit#rohit-laptop:~/backyard/jpywork$ java test
Exception in thread "main" java.lang.NoClassDefFoundError: org/python/core/PyObject
Caused by: java.lang.ClassNotFoundException: org.python.core.PyObject
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: test. Program will exit.
rohit#rohit-laptop:~/backyard/jpywork$
Please suggest the correct way.

Jython will automatically compile it into .class file on first execution, however in case you want to compile it, you can use standard library, find py_compile.py or compileall.py on Jython lib folder.

$ java test # is not the exact command to execute the class file
this class file requires jython.jar file to execute you have to give the jython.jar path at the run time.
#java -cp /home/litindia/jython-2.0.1/jython.jar:. test
-cp is compulsory /home/litindia/jython-2.0.1/jython.jar is my path where is jython.jar is present in my system, your path may be different. so please give the appropriate path.
And after the path :. is compulsory. Then file name is required.