Documentation for JIRA 4.2. Documentation for other versions of JIRA is available too. 
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JIRA 3.1 and above should not suffer from this problem. Invalid characters are automatically stripped from imported data
In older versions of JIRA it was possible to cut & paste text containing control characters into JIRA issue fields. This causes problems, because JIRA's backup format is XML, and XML does not allow for the storage of most control characters . When XML containing control characters is imported into JIRA, the import fails with an error:
To fix this, one needs to remove the control characters from the JIRA backup file. This can be done as follows:
java -jar atlassian-xml-cleaner-0.1.jar jiradata.xml > jiradata-clean.xml