This is a bug in Jackson JSON Processor, and also affects Confluence, as we can check on this log snippet:

      ERROR [http-8090-4] [[Standalone].[localhost].[/].[servlet-module-container-servlet]] log Servlet.service() for servlet servlet-module-container-servlet threw exception
      java.lang.RuntimeException: org.codehaus.jackson.JsonParseException: Illegal unquoted character ((CTRL-CHAR, code 9)): has to be escaped using backslash to be included in string value
       at [Source: java.io.StringReader@75224d47; line: 1, column: 16839]
      	at com.atlassian.mywork.host.dao.ao.AORegistrationDao.get(AORegistrationDao.java:47)
      	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      	at java.lang.reflect.Method.invoke(Unknown Source)
      	at com.atlassian.activeobjects.tx.TransactionalProxy.invoke(TransactionalProxy.java:79)
      	at com.atlassian.activeobjects.tx.TransactionalProxy.access$000(TransactionalProxy.java:18)
      	at com.atlassian.activeobjects.tx.TransactionalProxy$1.doInTransaction(TransactionalProxy.java:63)
      	at com.atlassian.sal.core.transaction.HostContextTransactionTemplate$1.doInTransaction(HostContextTransactionTemplate.java:25)
      	at com.atlassian.sal.spring.component.SpringHostContextAccessor$1.doInTransaction(SpringHostContextAccessor.java:88)
      	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
      	at com.atlassian.sal.spring.component.SpringHostContextAccessor.doInTransaction(SpringHostContextAccessor.java:82)
      	at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
      	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
      	at java.lang.reflect.Method.invoke(Unknown Source)
      	at 
      

      Link for the issue on Mainstream: https://jira.codehaus.org/browse/JACKSON-208

              Unassigned Unassigned
              falencastro FelipeA
              Affected customers:
              1 This affects my team
              Watchers:
              2 Start watching this issue

                Created:
                Updated:
                Resolved: