IllegalStateException when installing Java agent on WebSphere

This issue was found in our community discussion and feedback. A user installed the SkyWalking Java agent on WebSphere 7.0.0.11 and ibm jdk 1.8_20160719 and 1.7.0_20150407, and experienced the following error logs:

WARN 2019-05-09 17:01:35:905 SkywalkingAgent-1-GRPCChannelManager-0 ProtectiveShieldMatcher : Byte-buddy occurs exception when match type.
java.lang.IllegalStateException: Cannot resolve type description for java.security.PrivilegedAction
at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Resolution$Illegal.resolve(TypePool.java:144)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.pool.TypePool$Default$WithLazyResolution$LazyTypeDescription.delegate(TypePool.java:1392)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$AbstractBase$OfSimpleType$WithDelegation.getInterfaces(TypeDescription.java:8016)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.description.type.TypeDescription$Generic$OfNonGenericType.getInterfaces(TypeDescription.java:3621)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.hasInterface(HasSuperTypeMatcher.java:53)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.hasInterface(HasSuperTypeMatcher.java:54)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.matches(HasSuperTypeMatcher.java:38)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.HasSuperTypeMatcher.matches(HasSuperTypeMatcher.java:15)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Conjunction.matches(ElementMatcher.java:107)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:147)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:147)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:147)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:147)
at org.apache.skywalking.apm.dependencies.net.bytebuddy.matcher.ElementMatcher$Junction$Disjunction.matches(ElementMatcher.java:147)
...

The exception occured because access grant was required in WebSphere. Simply follow these steps:

Set the agent’s owner to the owner of WebSphere.
Add “grant codeBase “file:${agent_dir}/-” { permission java.security.AllPermission; };” in the file of “server.policy”.