NoClassDefFoundError Could not initialize class error

Question

When I run my project  I get numerous outputs of this error    Sep 9  2009 8 22 23 AM org apache catalina core StandardWrapperValve invoke SEVERE  Servlet service   for servlet Jersey threw exception java lang NoClassDefFoundError  Could not initialize class SpringFactory         at com point2 prospect persistence hibernate HibernateTransactionInterceptor doFilter HibernateTrans actionInterceptor java 17          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 235          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206          at com point2 prospect restapi ServerErrorInterceptor doFilter ServerErrorInterceptor java 27          at org apache catalina core ApplicationFilterChain internalDoFilter ApplicationFilterChain java 235          at org apache catalina core ApplicationFilterChain doFilter ApplicationFilterChain java 206          at org apache catalina core StandardWrapperValve invoke StandardWrapperValve java 233          at org apache catalina core StandardContextValve invoke StandardContextValve java 191          at org apache catalina core StandardHostValve invoke StandardHostValve java 128          at org apache catalina valves ErrorReportValve invoke ErrorReportValve java 102          at org apache catalina core StandardEngineValve invoke StandardEngineValve java 109          at org apache catalina connector CoyoteAdapter service CoyoteAdapter java 286          at org apache coyote http11 Http11Processor process Http11Processor java 845          at org apache coyote http11 Http11Protocol Http11ConnectionHandler process Http11Protocol java 583          at org apache tomcat util net JIoEndpoint Worker run JIoEndpoint java 447          at java lang Thread run Thread java 619    I notice that this problem has a pattern of being asked all over the web  but with no real answers  What is a general cause for this kind of error

User · Answer

You re missing the necessary class definition  typically caused by required JAR not being in classpath   From J2SE API      public class NoClassDefFoundError   extends LinkageError      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

User · Answer

Realised that I was using OpenJDK when I saw this error  Fixed it once I installed the Oracle JDK instead

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I had faced the same issue  because the jar library was copied by other Linux user root   and the logged in user process  did not have sufficient privilege to read the jar file content

User · Answer

NoClassDefFound error is a nebulous error and is often hiding a more serious issue  It is not the same as ClassNotFoundException  which is thrown when the class is just plain not there    NoClassDefFound may indicate the class is not there  as the javadocs indicate  but it is typically thrown when  after the classloader has loaded the bytes for the class and calls  defineClass  on them   Also carefully check your full stack trace for other clues or possible  cause  Exceptions  though your particular backtrace shows none    The first place to look when you get a NoClassDefFoundError is in the static bits of your class i e  any initialization that takes place during the defining of the class  If this fails it will throw a NoClassDefFoundError - it s supposed to throw an ExceptionInInitializerError and indicate the details of the problem but in my experience  these are rare  It will only do the ExceptionInInitializerError the first time it tries to define the class  after that it will just throw NoClassDefFound   So look at earlier logs   I would thus suggest looking at the code in that HibernateTransactionInterceptor line and seeing what it is requiring  It seems that it is unable to define the class SpringFactory  So maybe check the initialization code in that class  that might help   If you can debug it  stop it at the last line above  17  and debug into so you can try find the exact line that is causing the exception  Also check higher up in the log  if you very lucky there might be an ExceptionInInitializerError

User · Answer

I recently ran into this error on Windows 10  It turned out that windows was looking for  dll files necessary for my project and couldn t find them because it looks for them in the system path  PATH  rather than the CLASSPATH or -Djava library path

User · Answer

I had this    class Util     static boolean isNeverAsync   System getenv   get  asyncc exclude redundancy   equals  yes        you can probably see the problem  the env var might return null instead of string  So just to test my theory  I changed it to    class Util     static boolean isNeverAsync   false      and the problem went away  Too bad that Java can t give you the exact stack trace of the error though  kinda weird

[java] "NoClassDefFoundError: Could not initialize class" error

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