java opts utf 8_Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8

原创于 2021-02-16 07:17:44 发布 · 558 阅读

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博客介绍了因命令行有时无法访问或修改，JVM提供了JAVA_TOOL_OPTIONS变量。在Windows环境下，将该变量设置为-Dfile.encoding=UTF8，每次启动JVM时，Java的System属性会自动设置，设置成功会在System.err输出相应信息。

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From the JVM™ Tool Interface documentation…Since the command-line cannot always be accessed or modified, for example in embedded VMs or simply VMs launched deep within scripts, a JAVA_TOOL_OPTIONS variable is provided so that agents may be launched in these cases.By setting the (Windows) environment variable JAVA_TOOL_OPTIONS to -Dfile.encoding=UTF8, the (Java) System property will be set automatically every time a JVM is started. You will know that the parameter has been picked up because the following message will be posted to System.err:Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8