Glassfish 4.1上可以使用Java 8吗？

Question

我们当前使用的是Glassfish 4.1，我真的很想使用Java8。Glassfish4.1是否可以与Java 8一起使用，还是必须升级我的应用程序容器？

Answer 1

Simple answer,

Yes.

GlassFish 4.1 will work with Java 1.8.

Answer 2

In general: updating the jvm version alone rarely leads to issues.

Keep in mind that a lot of work goes into making sure that new Java versions are backwards compatible. And most importantly: a new jvm can always run byte code compiled for an older version of Java. The other way round (upgrading your application server for example) is much more likely to cause significant problems.

So, the (unspecific) answer here is: just try it. And for the record: Java 9 (or newer) with the new module system is a completely different story. But at least for now, the corresponding checking can be disabled on the command line.

Of course, there can be subtle issues for large applications. A new jvm may use different defaults for say, garbage collection settings (or use a different gc in the first place). That can of course change the runtime characteristics of large applications running in a large stack.

Answer 3

The best (and easiest) approach for determining whether Java version 'x' will work Glassfish version 'y' is to refer to the Release Note for that specific Glassfish release.

The Release Note will have a section titled Hardware and Software Requirements , and within that a sub-section titled Required JDK Versions .

For Release 4.1 the answer is :

GlassFish Server Open Source Edition Release 4.1 requires Oracle JDK 7 Update 65 or later, or Oracle JDK 8 Update 20 or later .

Notes:

• The word " later " in the part stating " Oracle JDK 8 Update 20 or later " is ambiguous, but it is referring only to the update level for the specified JDK version. Do not interpret " later " as implying that Glassfish 4.1 might work with Java 9 or higher. It would be much clearer if the wording was:

  GlassFish Server Open Source Edition Release 4.1 requires Oracle JDK 7 using Update 65 or later, or Oracle JDK 8 using Update 20 or later.

• It is incorrect to state that " Glassfish 4.1 will work with Java 7 or Java 8 ", because in both cases a minimum update level is also required.

• You can also get the minimum JDK requirements from Glassfish itself. Under the root of the unzipped download in a file named README.TXT there is a section titled 0. Prerequisite . For Glassfish 4.1 it is worth noting that the information given conflicts with that in the Release Note!...

  GlassFish 4.1 requires Oracle JDK 7 Update 65+ or Oracle JDK 8 Update 5+.

  In the odd cases where the requirements in the documentation conflict I'd always be inclined to choose the higher update level, and most of the time this is unlikely to be an issue.