I'm following this sample to test purview SDK for java, it could be built successful, but when I run this java file ,it shows "Exception in thread "main" java.lang.NoClassDefFoundError: org/reactivestreams/Publisher". the class "DefaultAzureCredentialBuilder" was defined in core-identity jar and I already imported it ,not clear why it still failed and what class it required?
here is my code content
We get this error when the class is not available in the program at runtime but class was successfully compiled by the java compiler.
The reason why you are getting this error is because of jre unable to find DefaultAzureCredentialBuilder class.
As you mentioned in the post that this class is defined inside core-identity jar. whether the jar file may be missing. So, try to import it again and check.
Related
I have this Problem. When i run my code in Intellij it works fine, but if i do an artifact and build the jar, it doesnt work. I think its caused by an extern library. Heres my output:
Exception in thread "main" java.lang.NoClassDefFoundError: com/mindfusion/scheduling/Calendar
at GUI.<init>(GUI.java:75)
at Logfiles.main(Logfiles.java:13)
Caused by: java.lang.ClassNotFoundException: com.mindfusion.scheduling.Calendar
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
... 2 more
I know which Class it is but i dont know how to solve the Problem. Im really just a beginner. Could you please help me and explain it simple. Thank you
Edit:
After i build the artifact with extracted Libraries this Error comes : Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
This error simply means the class file is not present in the jar.
One possible solution is you can download jd-gui which is used to look at jars. You can use this to check if the class is present.
Another solution is you can grep search the class in the jar with this simple command.
grep -l "<class-name>" <jar-name>.jar
if the class is not present in the jar file. you can add the class using jar command.
jar -cvf <jar-absolute-location> <class-path>
eg : jar -cvf GUI.jar com.mindfusion.scheduling.Calendar
The easiest way to understand this issue, it to read the Javadoc for that class. From the Javadoc:
Thrown if the Java Virtual Machine or a ClassLoader instance tries to
load in the definition of a class (as part of a normal method call or
as part of creating a new instance using the new expression) and no
definition of the class could be found.
The searched-for class definition existed when the currently executing class was compiled,
but the definition can no longer be found.
That means that NoClassDefFoundError can be thrown when that particular class is present during compile time but somehow not available during runtime. This could be due to missing JAR file, permission issues, or incorrect classpath on runtime.
Normally I see these issues when developers neglect to define the classpath for used libraries. They forget that your IDE has its own file defining the classpath (i.e. Eclipse has the .classpath file) so running the application from the IDE works fine (class is present during compile time), but after the application is compiled and the classpath is not defined in the machine hosting the application, NoClassDefFoundError is thrown (class "missing" at runtime).
My suggestion is figured out first if the classpath is correct. More times than none, this is the issue. If the classpath is correct, make sure all permissions are set correctly.
I'm trying to import a jar that I created to my project in Eclipse. When trying any calls from the so-called jar, I get the following exception:
Exception in thread "main" java.lang.NoClassDefFoundError
Caused by: java.lang.ClassNotFoundException
I believe this is caused due to the class being present on compile, but not being executed in runtime.
The problem is: When I run the jar on its own (without being imported), it works as intended, with all the functionalities. But I now need it to function as being part of a bigger jar, without changing the runtime classpath (didn't do that to the original project).
How can that be achieved?
#Edit
The class not being found or def not being found is ByteList, from the FastUtil library.
Exception in thread "main" java.lang.NoClassDefFoundError: it/unimi/dsi/fastutil/bytes/ByteList
It's imported TO another Jar, let's call it MyJar.jar; MyJar.jar functions perfectly as a standalone jar, as the intention for it is to be a library, and it functions by itself.
The situation is: When I import MyJar.jar to another project, it won't work anymore, I can't use it's methods and classes inside the new project.
MyJar.jar can be run from the command prompt, with java -jar MyJar.jar, and it will print it's test-page to show that it's working.
The new project compiles, but when it's ran, I get the class not found exceptions regarding MyJar project.
You can use Maven Assembly Plugin to add all classes from related JARs, otherwise you cannot load classes without adding them to classpath.
If you don't want to use Maven then add all needed classes manually to your JAR.
The Java program I wrote is giving a NoSuchMethodError when I run it in a normal Java Project but it is running properly when run inside a J2EE Web Project. The NoSuchMethodError is on a method written by me. It doesn't use any of the webtools. I have no clue why this is happening. Any insights on why this occurs? Also the program doesnt use J2EE components. By chance i ran it in a web project and it worked perfectly.
Software used:
1.Eclipse Indigo 3.7
2.jdk 1.7 ,jre7
3. Tomcat 7
EDIT 1.:
Exception in thread "main" java.lang.NoSuchMethodError:x.y.opinion.db.SentenceAccumulator.addSentenceForDocuId(ILcom/google/api/translate/Language;)V
at com.x.y.repo.RepoBuilder.processDocument(RepoBuilder.java:350)
at com.x.y.db.DataLoadJob.loadData(DataLoadJob.java:382)
at com.x.y.db.loadDataFromBackEnd.loadData(loadDataFromBackEnd.java:51)
at com.x.y.db.loadDataFromBackEnd.loadBackEnd(loadDataFromBackEnd.java:28)
at sample.main(sample.java:37)
EDIT 2. :
When i debug the program, it is asking me to add the source files for the jars. Below that it is saying
// Compiled from RepoBuilder.java (version 1.6 : 50.0, super bit)
But it was compiled using 1.7 only. I'm damn sure!
NoSuchMethodError happens when you write code for one version of a class and then run it with another that does not have a the method that you use. From the documentation:
Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
Normally, this error is caught by the compiler; this error can only occur at run time if the definition of a class has incompatibly changed.
Make sure that you have the same versions of the library that is giving the error in both environments.
If the error is thrown for a method that you wrote yourself you have a mixture of classes from different builds. Try deleting all class files and doing a clean build.
decodeThread = new DecodeThread(activity, decodeFormats, characterSet,
new ViewfinderResultPointCallback(activity.getViewfinderView()));
For the above code I am getting below exception:
01-24 01:33:02.078: E/AndroidRuntime(708): java.lang.NoClassDefFoundError: com.main.onlinecart.ViewfinderResultPointCallback
The class ViewfinderResultPointCallback is present in the same package of the calling class. I am not getting the error for other classes that are being used from the same package. What can be a possible problem here? Anything related to classpath? Where can i crosscheck the class path variable?
I am using eclipse (on mac os x) and running the project from Run configuration.
The class ViewfinderResultPointCallback implements another class ResultPointCallback which is not in the same package but it is present in a jar added in the build path of the project. And i see one exception in the log:
01-24 01:33:01.968: I/dalvikvm(708): Failed resolving com/main/onlinecart/ViewfinderResultPointCallback; interface 472 'Lcom/google/zxing/ResultPointCallback;'
01-24 01:33:01.968: W/dalvikvm(708): Link of class 'Lcom/main/onlinecart/ViewfinderResultPointCallback;' failed
but there are many other classes from the same jar which are not throwing any error.
Most of the time java.lang.NoClassDefFoundError is not the actual problem. There should be another exception before that.
You should be looking for an exception which happens during the static initialization of the class in the message (ViewfinderResultPointCallback). Any access to this class will trigger NoClassDefFound but it means only that the class is not loaded.
Don't confuse NoClassDefFoundError with ClassNotFoundException. The first might also occur if the class in question implements an interface and either of the two is provided in a new version (they don't match anymore). See http://javarevisited.blogspot.ch/2011/06/noclassdeffounderror-exception-in.html for more details.
The NoClassDefFoundError was because of my class' dependency on one of the interfaces from a jar. The error got solved when i added the jar to my project's libs directory. This is required because i am working on an android project and when .apk file is created, it adds the jars from libs folder for run time use.
I am trying to run a java program on my AIX server. I wrote the classpath
/usr/java6/bin/javac -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar -d . *.java
which seems to compile correctly. Then when I run the program
java daily_transmission
i get the error java.lang.NoClassDefFoundError: javax.mail.Address. All the .jar files that were in Eclipse when it worked before are in the /usr/jdk file.
A NoClassDefFoundError means that (quoting the relevant JavaDoc):
Thrown if the Java Virtual Machine or a ClassLoader instance tries to
load in the definition of a class (as part of a normal method call or
as part of creating a new instance using the new expression) and no
definition of the class could be found.
The searched-for class definition existed when the currently executing
class was compiled, but the definition can no longer be found.
Two things to check:
Firstly, you appear to have have a typo in your classpath (though it can't have been there when you compiled the code, or it wouldn't have compiled successfully, so that's clearly not the root cause of the exception you're seeing.):
/urs/jdk/mail.jar
should be
/usr/jdk/mail.jar
Make sure that you are also using the -classpath option to pass the classpath to java as well as to javac to pick up those .jar files at runtime:
java -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar daily_transmission
NoClassDefFoundError means that the ClassLoader was able to find the class, but it was not able to be loaded. This usually happens when some static field in the offending class could not be initialized. So I am sure that your classpath might be correct; but some static field in that class could not be set correctly.