Solving Runtime Class Conflicts with a Custom ClassLoader
Introduction
When building SDKs that integrate into diverse applications, one of the biggest challenges is avoiding runtime class conflicts. In this post, we’ll explore how we solved this problem using a Custom ClassLoader.
Problem Statement
When integrating our SDK with target applications, we faced runtime conflicts between SDK classes and application classes.
Typical issues included:
- ClassCastException
- NoClassDefFoundError
- Instrumentation interference
These conflicts broke both the SDK and the target application execution.
Solution: Custom ClassLoader
We solved this by implementing a Custom ClassLoader that:
- Loads SDK classes in a separate namespace
- Delegates application classes to the parent system ClassLoader
- Ensures complete class isolation
This prevented runtime conflicts between the instrumentation framework and the target application.
Before: Problem Example
Error message:
After: Custom ClassLoader Implementation
Usage Example:
Key Takeaway
By using a Custom ClassLoader, we achieved clean isolation between SDK and application code. This solution eliminated class conflicts and enabled smooth execution of both components.
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