I noticed a bootstrap warning when compiling cdk-base;
bootstrap class path not set in conjunction with -source 8

ttbomk using release instead of source / target is best practice.

Setting <release>8</release> is essentially equivalent to:

1. Setting <source>1.8</source>.
2. Setting <target>1.8</target>.
3. Additionally, it also configures the compiler to use the platform APIs of the specified Java version (Java 8 in this case), preventing accidental use of APIs from a newer JDK. This is accomplished by setting the --release flag of the compiler, which correctly configures the bootstrap classpath. javac