項(xiàng)目引入了日志包log4j-api-2.10.0.jar，log4j從2.9版本開始支持JDK9，當(dāng)前項(xiàng)目使用混淆器proguard5.3.3對(duì)代碼進(jìn)行混淆，proguard5.3.3只對(duì)JDK支持到1.8，混淆時(shí)會(huì)報(bào)錯(cuò)

Can't read [D:\proguardConfig\lib\log4j-api-2.10.0.jar] (Can't process class [META-INF/versions/9/org/apache/logging/log4j/util/ProcessIdUtil.class] (Unsupported class version number [53.0] (maximum 52.0, Java 1.8)))

要解決報(bào)錯(cuò)需屏蔽log4j中使用java9 api的類。在proguard的配置文件中l(wèi)og4j-api-2.10.0.jar后面加入(!META-INF/versions/9/**.class,!module-info.class)

配置文件示例

-libraryjars lib\log4j-api-2.10.0.jar(!META-INF/versions/9/**.class,!module-info.class)
-libraryjars lib\log4j-core-2.10.0.jar
-libraryjars lib\log4j-jcl-2.10.0.jar
-libraryjars lib\log4j-web-2.10.0.jar