Remove unnecessary Guava dependency

[Sandmania]

In commit Support CS in Java com.google.guava:guava:25.1-jre was added as a dependency to aws-xray-recorder-sdk-core/pom.xml. To the best of my knowledge this is not used anywhere (all tests pass without it) and unnecessarily bloats up modules that depend on aws-xray-recorder-sdk-core. This can have adverse performance impacts in places like lambda deployments.

For the time being, I've manually excluded the dependency like so:

        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-xray-recorder-sdk-aws-sdk</artifactId>
            <version>2.0.1</version>
            <exclusions>
                <exclusion>
                    <groupId>com.google.guava</groupId>
                    <artifactId>guava</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.amazonaws</groupId>
            <artifactId>aws-xray-recorder-sdk-aws-sdk-instrumentor</artifactId>
            <version>2.0.1</version>
        </dependency>

X-Ray instrumentation seems to work as expected even without guava. Please let me know if excluding this dependency might lead into some unwanted results.

[haotianw465]

You are right. This dependency is unnecessary and we will remove it in our next release.

[haotianw465]

This issue is fixed as part of 2.1.0 release. See CHANGELOG for details.