Troubleshooting for Java SDK

Understand what to do when you encounter the most common issues.

java.lang.NoClassDefFoundError: kotlin/enums/EnumEntriesKt

If you encounter java.lang.NoClassDefFoundError: kotlin/enums/EnumEntriesKt, ensure that the effective Kotlin version in your project is 1.9+. This is required for the PubNub Java SDK to work properly.

Root cause

The java.lang.NoClassDefFoundError: kotlin/enums/EnumEntriesKt error may occur when an old version of spring-boot-dependencies is defined in the dependency-management section of pom.xml:

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>2.6.13</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

In such case, dependencies like kotlin-stdlib and kotlin-stdlib-common are enforced in version 1.6.21 that is too old for the PubNub Java SDK to work properly.

Fix

There are two ways to fix the java.lang.NoClassDefFoundError: kotlin/enums/EnumEntriesKt issue:

• Add explicit declarations of kotlin-stdlib and kotlin-stdlib-common in version 1.9.+ to your pom.xml file.

  <dependency>
    <groupId>org.jetbrains.kotlin</groupId>
    <artifactId>kotlin-stdlib</artifactId>
    <version>1.9.10</version>
  </dependency>

  <dependency>
    <groupId>org.jetbrains.kotlin</groupId>
    <artifactId>kotlin-stdlib-common</artifactId>
    <version>1.9.10</version>
  </dependency>

• Update the spring-boot version to one that enforces kotlin-stdlib and kotlin-stdlib-common in version 1.9.+, such as 3.4.5 or higher.