"Using a low-pause collector such as G1 should provide a better overall experience, for most users, than a throughput-oriented collector such as the Parallel GC, which was the previous default," said Oracle. With garbage collection, the G1 collector is slotted as the default collector on 32- and 64-bit server configurations.
"If you see deprecation with removal warnings, you should address those soon." "You may see more deprecation warnings than previously," Oracle said. The Java Dependency Analysis tool will identify dependencies. Most of the internal APIs in the JDK are inaccessible by default, so developers might get errors at runtime - IllegalAccessErrors - indicating an application or libraries are dependent on internal APIs. Oracle also recommends looking at tests to make sure application behavior is the same as it was with JDK 8.Ĭompilation using the JDK 9 compiler might fail for a number of reasons, according to Oracle. When running their applications, developers are cautioned about unrecognized VM options from the JVM. To prepare for the migration, Oracle suggests getting the early access build, running a program before recompiling, updating third-party libraries, compiling an application, and running the jdeps static analysis on code.
"Code that uses only official Java SE Platform APIs and supported JDK-specific APIs should continue to work without change." But code that uses certain features or JDK-internal APIs may not run or may give different results, the company cautioned. "The modularization of the Java SE Platform brings many benefits but also many changes," Oracle said.
The newly released JDK (Java Development Kit) 9 Migration Guide notes that every update brings with it binary, source, and behavioral incompatibilities with previous versions. In preparation for the planned July release of Java 9, Oracle has released guidance for moving applications over to the forthcoming upgrade, which features big changes through modularization.
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