java lang NoClassDefFoundError Could not initialize class XXX

Question

public class PropHolder     public static Properties prop     static         code for loading properties from file           Referencing the class somewhere else  Properties prop   PropHolder prop    class PropHolder is a class of my own  The class resides in the same JAR file of the main class  So that should not because any JAR is missing from classpath   When I look in to the JAR file by jar tf myjarfile  I can see the PropHolder class listed there   Btw  the code is running fine on my local machine  But couldn t work when I deploy it with some script onto a Linux server  So I think it is not the problem of the code  But for some reason  the deploy process is very hard to track   What could be the problem

User · Answer

I had the same exception - but only while running in debug mode, this is how I solved the problem (after 3 whole days): in the build.gradle i had : "multiDexEnabled true" set in the defaultConfig section.

        defaultConfig {
    applicationId "com.xxx.yyy"
    minSdkVersion 15
    targetSdkVersion 28
    versionCode 5123
    versionName "5123"
    // Enabling multidex support.
    multiDexEnabled true
}

but apparently this wasn't enough. but when i changed:

public class MyAppClass  extends Application

to:

public class MyAppClass  extends MultiDexApplication

this solved it. hope this will help someone

User · Answer

My best bet is there is an issue here   static         code for loading properties from file     It would appear some uncaught exception occurred and propagated up to the actual ClassLoader attempting to load the class   We would need a stacktrace to confirm this though   Either that or it occurred when creating PropHolder prop static variable

User · Answer

You are getting a java lang NoClassDefFoundError which does NOT mean that your class is missing  in that case you d get a java lang ClassNotFoundException   The ClassLoader ran into an error while reading the class definition when trying to read the class   Put a try catch inside your static initializer and look at the exception  If you read some files there and it differs from your local environment it s very likely the cause of the problem  maybe file can t be found  no permissions etc

User · Answer

As mentioned above  this could be a number of things   In my case I had a statically initialized variable which relied on a missing entry in my properties file   Added the missing entry to the properties file and the problem was solved

User · Answer

I encounter the same problem  I inited a bean object in static block like below  static       try          mqttConfiguration   SpringBootBeanUtils  lt MqttConfiguration gt getBean MqttConfiguration class        catch  Throwable e           System out println e             Just because the process the my bean obejct inition caused a NPE  I get trouble into it  So I think you should check you static code block carefully

User · Answer

I had the same problems java lang NoClassDefFoundError  Could not initialize class com xxx HttpUtils  static         code for loading properties from file     it is the environment problem That means the properties in application yml is incorrect or empty

User · Answer

If you re working on an Android project  make sure you aren t calling any static methods on any Android classes   I m only using JUnit   Mockito  so maybe some other frameworks might help you avoid the problem altogether  I m not sure   My problem was calling Uri parse uriString  as part of a static initializer for a unit test   The Uri class is an Android API  which is why the unit test build couldn t find it   I changed this value to null instead and everything went back to normal

User · Answer

NoClassDefFoundError doesn t give much of a clue as to what went wrong inside the static block   It is good practice to always have a block like this inside of static         initialization code   static     try            your init code here      catch  Throwable t        LOG error  Failure during static initialization   t       throw t

User · Answer

Just several days ago  I met the same question just like yours  All code runs well on my local machine  but turns out error noclassdeffound amp initialize    So I post my solution  but I don t know why  I merely advance a possibility  I hope someone know will explain this  John Vint Firstly  I ll show you my problem  My code has static variable and static block both  When I first met this problem  I tried John Vint s solution  and tried to catch the exception  However  I caught nothing  So I thought it is because the static variable but now I know they are the same thing  and still found nothing  So  I try to find the difference between the linux machine and my computer  Then I found that this problem happens only when several threads run in one process By the way  the linux machine has double cores and double processes   That means if there are two tasks both uses the code which has static block or variables  run in the same process  it goes wrong  but if they run in different processes  both of them are ok  In the Linux machine  I use  mvn -U clean  test -Dtest path    to run a task  and because my static variable is to start a container or maybe you initialize a new classloader   so it will stay until the jvm stop  and the jvm stops only when all the tasks in one process stop  Every task will start a new container or classloader  and it makes the jvm confused  As a result  the error happens  So  how to solve it  My solution is to add a new command to the maven command  and make every task go to the same container   -Dxxx version xxxxx  sorry can t post more   Maybe you have already solved this problem  but still hope it will help others who meet the same problem

User · Answer

I had the same exception  this is how I solved the problem   Preconditions    Junit class  and test   that extended another class  ApplicationContext initialized using spring  that init the project  The Application context was initialized in  Before method   Solution   Init the application context from  BeforeClass method  since the parent class also required some classes that were initialized from within the application context   Hope this will help

[java] java.lang.NoClassDefFoundError: Could not initialize class XXX

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