| # IllegalStateException when installing Java agent on WebSphere |
| This issue was found in our [community discussion and feedback](https://github.com/apache/skywalking/issues/2652). |
| 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: |
| |
| 1. Set the agent's owner to the owner of WebSphere. |
| 2. Add "grant codeBase "file:${agent_dir}/-" { permission java.security.AllPermission; };" in the file of "server.policy". |
| |
