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java.lang.NullPointerException: null	at org.apache.coyote.http11.Http11OutputBuffer.commit(Http11OutputBuffer.java:351)	at org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:658)	at org.apache.coyote.Response.action(Response.java:169)	at org.apache.coyote.Response.sendHeaders(Response.java:354)	at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:322)	at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:303)	at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:109)	at com.fasterxml.jackson.core.json.UTF8JsonGenerator.flush(UTF8JsonGenerator.java:1030)	at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:2486)	at com.fasterxml.jackson.core.base.GeneratorBase.writeObject(GeneratorBase.java:367)