问题：
Cause: superclass access check failed: class butterknife.compiler.ButterKnifeProcessor$RScanner (in unnamed module @0x17a5aa4b) cannot access class com.sun.tools.javac.tree.TreeScanner (in module jdk.compiler) because module jdk.compiler does not export com.sun.tools.javac.tree to unnamed module @0x17a5aa4b
解决方案：
gradle.properties中配置以下：
org.gradle.jvmargs=-Xmx1920M \
--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED \
--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED \
--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED
