JDK7交叉编译

最新推荐文章于 2025-08-01 13:23:52 发布

转载最新推荐文章于 2025-08-01 13:23:52 发布 · 548 阅读

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原文链接：https://my.oschina.net/zuoyc/blog/375282

文章标签：

#java #runtime

为什么80%的码农都做不了架构师？>>>

要解决的问题

用JDK7编译出能在JRE6里头运行的class文件

坑

Maven Compiler Plugin

(Maven Compiler Plugin)[http://maven.apache.org/plugins/maven-compiler-plugin/]

Merely setting the target option does not guarantee that your code actually runs on a JRE with the specified version. The pitfall is unintended usage of APIs that only exist in later JREs which would make your code fail at runtime with a linkage error. To avoid this issue, you can either ** configure the compiler's boot classpath to match the target JRE **or **use the Animal Sniffer Maven Plugin to verify your code doesn't use unintended APIs **

来源： http://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html

仅仅去设定target的值并不能保证你的程序可以在更低版本的jre上面运行，因为这个只是language level上面的保证。

解决思路

用RT.JAR去验证

<compilerArguments>
    <bootclasspath>xxxxxxxxx</bootclasspath>
</compilerArguments>

这个还能叫做交叉编译，用其他的JRE去验证

直接用别的版本的JAVAC去编译 examples/compile-using-different-jdk.html

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.2</version>
    <configuration>
        <source>1.6</source>
        <target>1.6</target>
        <verbose>true</verbose>
        <fork>true</fork>
        <executable>${jdk6.home}/bin/javac</executable>
        <compilerVersion>1.6</compilerVersion>
    </configuration>
</plugin>

问题是这就不是交叉编译了。。。

想要检查最后出来的字节文件是什么版本的java字节码

javap -verbose jp.co.worksap.updater.api.ServerType | grep major

转载于:https://my.oschina.net/zuoyc/blog/375282