Github user PascalSchumacher commented on a diff in the pull request: https://github.com/apache/incubator-groovy/pull/124#discussion_r41235241 --- Diff: subprojects/groovy-json/src/main/java/groovy/json/JsonOutput.java --- @@ -61,7 +61,8 @@ private static final String NULL_VALUE = "null"; private static final String JSON_DATE_FORMAT = "yyyy-MM-dd'T'HH:mm:ssZ"; private static final String DEFAULT_TIMEZONE = "GMT"; - + private static final SimpleDateFormat dateFormat = new SimpleDateFormat(JSON_DATE_FORMAT); --- End diff -- SimpleDateFormat is not thread-safe (see http://stackoverflow.com/questions/6840803/simpledateformat-thread-safety for an explanation)
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