September 2018
Intermediate to advanced
802 pages
19h 30m
English
The data required for compiling to a target older version is stored in the $JDK_ROOT/lib/ct.sym file. This information is used by the --release option to locate bootclasspath. The ct.sym file is a ZIP file containing stripped-down class files corresponding to class files from the target platform versions (taken verbatim from http://openjdk.java.net/jeps/247).
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