Help Center/ Object Storage Service/ SDK Reference/ Java/ Fault Locating (SDK for Java)/ Resolving Dependency Missing or Conflicts (SDK for Java)
Updated on 2026-08-14 GMT+08:00
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Resolving Dependency Missing or Conflicts (SDK for Java)

Dependency missing and dependency conflict are commonly encountered in Java development. When using the common SDK for Java, if the error message "ClassNotFoundException" or "NoClassDefFoundError" is reported during application compilation and running, check whether this is a problem related to dependencies. If yes, perform the following steps to locate and rectify the fault.

Background Knowledge

The SDK for Java comes in two versions: bundle and standard. The comparison between the two versions is as follows:

Dimension

Standard

Bundle

Application scenario

The standard version is small in size and suitable for space-sensitive scenarios.

This version is applicable to space-insensitive scenarios where dependency conflicts are difficult to resolve.

Source code

The source code of the bundle version is the same as that of the standard version.

Space used

Small. It contains only the SDK code and does not have built-in third-party dependencies.

Large. In the bundle version, all third-party dependencies are packaged and redirected to the package, without depending on external third-party packages. This prevents problems caused by dependency conflicts.

Maven configuration

 
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<dependency>
   <groupId>com.huaweicloud</groupId>
   <artifactId>esdk-obs-java</artifactId>
   <version>versionNumber</version>
</dependency>

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<dependency>
   <groupId>com.huaweicloud</groupId>
   <artifactId>esdk-obs-java-bundle</artifactId>
   <version>bundleVersionNumber</version>
</dependency>

Solution

Dependency Missing

The following table lists the third-party components (including their versions) that the latest SDK depends on.

Dependency

Version

Description

okhttp

4.12.0

Used to send HTTP requests.

okio

3.8.0

Component of OkHttp

jackson-core

2.15.4

Used to construct and parse JSON files.

jackson-databind

2.15.4

Component of jackson-core

jackson-annotations

2.15.4

Component of jackson-core

Dependency Conflict

If your project has multiple versions of OBS Java SDK packages or third-party dependencies, dependency conflicts may occur. If there are SDKs of earlier versions, delete them and use the latest version. If there are multiple versions of third-party dependencies, replace the conflicting ones with the versions required by the SDK.