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java.lang.UnsupportedOperationException: 	at java.util.AbstractMap.put(AbstractMap.java:186)	at org.apache.velocity.VelocityContext.internalPut(VelocityContext.java:132)	at org.apache.velocity.context.AbstractContext.put(AbstractContext.java:164)	at org.apache.velocity.context.InternalContextAdapterImpl.put(InternalContextAdapterImpl.java:269)	at org.apache.velocity.runtime.parser.node.ASTSetDirective.render(ASTSetDirective.java:213)	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:336)	at org.apache.velocity.Template.merge(Template.java:328)	at org.apache.velocity.Template.merge(Template.java:235)	at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:381)	at org.apache.velocity.app.VelocityEngine.mergeTemplate(VelocityEngine.java:345)	at org.springframework.ui.velocity.VelocityEngineUtils.mergeTemplate(VelocityEngineUtils.java:58)	at org.springframework.ui.velocity.VelocityEngineUtils.mergeTemplateIntoString(VelocityEngineUtils.java:122)