使用旧的JDK库降级Eclipse ant进行编译（Java 1.7 - > 1.6） [英] Downgrade Eclipse ant to compile while using older JDK libraries (Java 1.7 -> 1.6)

问题描述

我有与升级Eclipse Java编译器相反的问题：我使用Eclipse 3.7 .1 可以支持JDK 1.7，但是现在我正在开发JDK 1.6 ...这是一个很好的工作，但是当我做一个蚂蚁构建的时候，我突然发现这样的错误（见下文）。

I have the opposite problem as Upgrade Eclipse java compiler: I'm using Eclipse 3.7.1 that can support JDK 1.7, but right now I am developing for JDK 1.6... which has been working fine, but suddenly I'm getting tons of errors like this when I do an ant build (see below).

我想使用JDK 1.6;我在哪里设置？ Eclipse设置正确（每个项目的Java Build Path指向JRE System Library [jdk1.6.0_16]），但是蚂蚁似乎无视它。

I want to use JDK 1.6; where do I set that? Eclipse is set properly (Java Build Path for each project points to JRE System Library [jdk1.6.0_16]), but ant seems to be disregarding it.

[javac] warning: java\nio\ByteBuffer.class(java\nio:ByteBuffer.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\lang\Object.class(java\lang:Object.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\Collections.class(java\util:Collections.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.
[javac] warning: java\util\EnumMap.class(java\util:EnumMap.class): major version 51 is newer than 50, the highest major version supported by this compiler.
[javac] It is recommended that the compiler be upgraded.

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更新：更多线索 - 这是第一个时间我已经在一个单独的Eclipse工作区中构建了这个特定的项目，从之前的工作区导入项目。我转而回到旧的工作区，并建立了相同的项目，并建立了良好的状态。

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update: More clues -- this is the first time I've built this particular project in a separate Eclipse workspace that imports the project from a previous workspace. I switched back to the old workspace and built the same project and it builds fine.

差异似乎是蚂蚁在我的新工作区中的1.7 JRE中运行，但是蚂蚁在我的旧工作区中的1.6 JRE中运行。是什么赋予了？我在哪里设置？我似乎无法弄清楚哪个设置是不同的。

The difference seems to be that ant runs in a 1.7 JRE in my new workspace, but ant runs in a 1.6 JRE in my old workspace. What gives? Where do I set this? I can't seem to figure out which setting is different.

推荐答案

发现：

在Eclipse的Ant选项卡中，如果您右键单击构建，然后单击运行方式 - >Ant构建，则会弹出编辑配置对话框，您可以选择要用于Ant的JRE。

In the Ant tab in Eclipse, if you right-click on your build, and click Run As -> Ant Build..., then it will pop up an "Edit Configuration" dialog box, and you can select which JRE you want to use for Ant.

我不知道此设置存储在哪里，但它似乎存储在工作区而不是项目中设置。

I don't know where this setting is stored, but it appears to be stored in the workspace rather than with the project settings.

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