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    Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

Solutions on the web

via Stack Overflow by lantonis
, 2 years ago
via Stack Overflow by Fike
, 2 years ago
java.lang.NumberFormatException: Invalid int: ""	at java.lang.Integer.invalidInt(Integer.java:138)	at java.lang.Integer.parseInt(Integer.java:358)	at java.lang.Integer.parseInt(Integer.java:334)	at java.lang.Integer.valueOf(Integer.java:525)	at com.cloud3squared.meteogram.MeteogramService.cacheFileName(MeteogramService.java)