https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327670#M97033 I am attempting to use the isDate function in an expression for a incoming 8 character date string to see if it is a valid date or not. The date is in a ?yyyymmdd? format. The expression I am using is as follows: TalendDate.isDate(row1.OPTOUT_DATE,"yyyyMMdd") == true ? TalendDate.parseDate("yyyy-MM-dd",row1.OPTOUT_DATE):null. I am using the Test functionality in Expression Builder to ensure the logic works. It does if I change the date format to ?yyyy-MM-dd?, but not ?yyyyMMdd?. Test window in Expression builder displays the following error when I a date such as 20130906 as a value for the OPTOUT_DATE variable: Exception in thread "main" java.lang.Error: Unresolved compilation problems: . Has anyone encountered this issue before and do you have a resolution or workaround I can use in Talend Expression Builder. Fri, 06 Sep 2013 16:00:25 GMT Anonymous 2013-09-06T16:00:25Z https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327670#M97033 I am attempting to use the isDate function in an expression for a incoming 8 character date string to see if it is a valid date or not. The date is in a ?yyyymmdd? format. The expression I am using is as follows: TalendDate.isDate(row1.OPTOUT_DATE,"yyyyMMdd") == true ? TalendDate.parseDate("yyyy-MM-dd",row1.OPTOUT_DATE):null. I am using the Test functionality in Expression Builder to ensure the logic works. It does if I change the date format to ?yyyy-MM-dd?, but not ?yyyyMMdd?. Test window in Expression builder displays the following error when I a date such as 20130906 as a value for the OPTOUT_DATE variable: Exception in thread "main" java.lang.Error: Unresolved compilation problems: . Has anyone encountered this issue before and do you have a resolution or workaround I can use in Talend Expression Builder. Fri, 06 Sep 2013 16:00:25 GMT https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327670#M97033 Anonymous 2013-09-06T16:00:25Z https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327671#M97034 Shouldn't the formats that you're passing to isDate and parseDate be the same? Fri, 06 Sep 2013 16:27:27 GMT https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327671#M97034 Anonymous 2013-09-06T16:27:27Z https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327672#M97035 And don't trust the Test window in Expression builder. Best way is to look at the whole generated Code or run the job. Sat, 07 Sep 2013 01:00:33 GMT https://community.qlik.com/t5/Talend-Studio/Talend-isDate-function-generating-a-java-lang-Error-on-yyyyMMdd/m-p/2327672#M97035 alevy 2013-09-07T01:00:33Z