groovy.lang.GroovyRuntimeException: Cannot set read-only property: session

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groovy.lang.GroovyRuntimeException: Cannot set read-only property: session
at hellog3.UserInterceptor.before(UserInterceptor.groovy:8)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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