[example][java] Add ReAct agent example

[letaoj]

Linked issue: #229

Purpose of change

This change added a example for the ReAct agent quickstart guide in Java similar to what python did. In this change, we are made a couple improvement to the existing single and multiple agent example to remove unused connection setup.

Tests

❯ cd examples; java --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED --add-opens java.base/java.text=ALL-UNNAMED --add-opens java.desktop/java.awt.font=ALL-UNNAMED -cp "target/classes:$(mvn dependency:build-classpath -q -Dmdep.outputFile=/dev/stdout)" org.apache.flink.agents.examples.ReActAgentExample; cd ..
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.esotericsoftware.kryo.util.UnsafeUtil (file:/Users/ljiang/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar) to constructor java.nio.DirectByteBuffer(long,int,java.lang.Object)
WARNING: Please consider reporting this to the maintainers of com.esotericsoftware.kryo.util.UnsafeUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
8> ProductReviewAnalysisRes{id='B009MA34NY', score=5, reasons=[good support, comfortable, lightweight, well-made, long lasting]}
4> ProductReviewAnalysisRes{id='B009MA34NY', score=5, reasons=[]}
1> ProductReviewAnalysisRes{id='B000YFSR5G', score=2, reasons=[did not fit well, not comfortable]}
5> ProductReviewAnalysisRes{id='B009MA34NY', score=5, reasons=[]}
7> ProductReviewAnalysisRes{id='B001IKJOLW', score=5, reasons=[]}
9> ProductReviewAnalysisRes{id='B000YFSR4W', score=5, reasons=[]}
6> ProductReviewAnalysisRes{id='B010RRWKT4', score=5, reasons=[]}
11> ProductReviewAnalysisRes{id='B000YFSR5G', score=5, reasons=[]}
10> ProductReviewAnalysisRes{id='B010RRWKT4', score=5, reasons=[comfortable]}
12> ProductReviewAnalysisRes{id='B014IBJKNO', score=5, reasons=[]}
3> ProductReviewAnalysisRes{id='B0092UF54A', score=5, reasons=[excellent product quality]}
8> ProductReviewAnalysisRes{id='B010RRWKT4', score=5, reasons=[]}
2> ProductReviewAnalysisRes{id='B000YFSR4W', score=1, reasons=[damaged product upon delivery]}
4> ProductReviewAnalysisRes{id='B000KPIHQ4', score=5, reasons=[]}
1> ProductReviewAnalysisRes{id='B0058YEJ5K', score=5, reasons=[comfortable]}
5> ProductReviewAnalysisRes{id='B005AGO4LU', score=5, reasons=[comfortable, great for weight training]}
7> ProductReviewAnalysisRes{id='B0058YEJ5K', score=2, reasons=[poor quality, overpriced]}

API

Documentation

[letaoj]

One thing that I'm not sure is whether the notifyShipping tools was called or not. At least, i'm not able to see it from the short period that I ran it.

[letaoj]

@wenjin272 @xintongsong @Sxnan please take a look when you gets time.

[wenjin272]

Hi, @letaoj, thanks for your work.

The tool is exactly called, but it fell into recursion.

[wenjin272]

Should use org.apache.flink.agents.examples.agents.CustomTypesAndResources.notifyShippingManager( id, review); here.

[letaoj]

Thanks for catching this. This is not an obvious bug. Is that possible to write this code in a different way so that I do not need to have this sort of redundent call in the ReAct agent?

[wenjin272]

Maybe you can add @tool and @ToolParam directly on the notifyShippingManager method in CustomTypesAndResources, and register it in agents execution envrionment.