Upgrade Guava library to version 32.0.0-jre in cdap

[AbhishekKumar9984]

Updated the Guava dependency version in pom.xml to 32.0.0-jre.
Ensured compatibility with the upgraded Guava version.

[gemini-code-assist]

Code Review

This pull request adds a dependency on Guava to cdap-data-fabric and introduces a workaround class TxMetricsCollector to satisfy the Tephra TransactionManager. The review feedback highlights that using reflection to invoke start/stop and startAsync/stopAsync on the delegate service is unnecessary and problematic. It introduces performance overhead from caught exceptions and risks IllegalAccessException on newer Java versions. The reviewer suggests directly calling delegate.startAsync() and delegate.stopAsync() instead.

[gemini-code-assist]

Since this class is compiled against Guava 32.0.0-jre and CDAP runs with Guava 32.0.0-jre, the delegate (which is a Service) is guaranteed to have the startAsync() and stopAsync() methods at runtime.

Using reflection here is not only unnecessary but also introduces several issues:

1. Performance/Exception Overhead: Every call to start() or stop() will always fail the first getMethod("start") / getMethod("stop") lookup, throwing and catching a NoSuchMethodException before falling back to the catch block.
2. Access Control Issues: Calling getMethod on delegate.getClass() (which is an anonymous class and thus non-public) and invoking it can throw an IllegalAccessException on newer Java versions (Java 9+) due to strong encapsulation.

We can safely simplify these methods by calling delegate.startAsync() and delegate.stopAsync() directly.

  public ListenableFuture<Service.State> start() {
    delegate.startAsync();
    return Futures.immediateFuture(Service.State.RUNNING);
  }

  public ListenableFuture<Service.State> stop() {
    delegate.stopAsync();
    return Futures.immediateFuture(Service.State.TERMINATED);
  }

  public Service startAsync() {
    delegate.startAsync();
    return this;
  }

  public Service stopAsync() {
    delegate.stopAsync();
    return this;
}