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I had a perfectly working code yesterday, in the exact form of: int lastRecord = 1; String key = String.format("%08d", Integer.toString(lastRecord)); Which would pad it nicely to 00000001. Now I kicked it up a notch with twoKeyChar getting a string from a table and lastRecord getting an int from a table. As you can see the concept is essentially the same - I convert an int to a string and try to pad it with 0s; however, this time I get the following error: java.util.IllegalFormatConversionException: d != java.lang.String The code is below: String newPK = null; String twoCharKey = getTwoCharKey(tablename); if (twoCharKey != null) { int lastRecord = getLastRecord(tablename); lastRecord++; //The println below outputs the correct values: "RU" and 11. System.out.println("twocharkey:"+twoCharKey+"record:"+lastRecord+"<"); //Now just to make it RU00000011 newPK = String.format("%08d", Integer.toString(lastRecord)); newPK = twoCharKey.concat(newPK); } I feel like I must have typed something wrong, because there is no reason for it to break since the last time when it worked. Any help/hint is appreciated! Thank You!

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