Fix Java.lang.ClassFormatError: Duplicate interface name "org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/EnhancedInstance"

[zifeihan]

Fix Java.lang.ClassFormatError: Duplicate interface name "org/apache/skywalking/apm/agent/core/plugin/interceptor/enhance/EnhancedInstance"

• Add a unit test to verify that the fix works.
• Explain briefly why the bug exists and how to fix it.

The cause and fix of the problem are as follows, #6172

[codecov]

Codecov Report

Merging #6173 (0267d6d) into master (3e4d550) will decrease coverage by 19.38%.
The diff coverage is 66.66%.

@@              Coverage Diff              @@
##             master    #6173       +/-   ##
=============================================
- Coverage     51.23%   31.85%   -19.39%     
+ Complexity     3526      740     -2786     
=============================================
  Files          1700     1627       -73     
  Lines         35972    33975     -1997     
  Branches       3975     4236      +261     
=============================================
- Hits          18431    10822     -7609     
- Misses        16594    22237     +5643     
+ Partials        947      916       -31     

Impacted Files	Coverage Δ	Complexity Δ
.../interceptor/enhance/ClassEnhancePluginDefine.java	47.67% <66.66%> (-0.57%)	15.00 <0.00> (ø)
...he/skywalking/oal/rt/output/DispatcherContext.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...skywalking/oal/rt/output/AllDispatcherContext.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...ache/skywalking/oap/server/core/source/Source.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
...che/skywalking/oap/server/core/source/Service.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...che/skywalking/oap/server/core/source/SideCar.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...he/skywalking/oap/server/core/source/Endpoint.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-6.00%)
...he/skywalking/oap/server/core/source/GCPhrase.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...e/skywalking/oap/server/core/CoreModuleConfig.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
.../skywalking/oap/server/core/alarm/AlarmModule.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-2.00%)
... and 647 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3e4d550...0267d6d. Read the comment docs.

[wu-sheng]

LGTM. Let's wait for the all plugin tests to verify.