# NumberFormatException for Springfox-swagger version 2.9.2
Many friends will encounter a NumberFormatException after upgrading Springfox-Swagger to version 2.9.2.
java.lang.NumberFormatException: For input string: ""
The exception information is as follows:
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) ~[na:1.8.0_111]
at java.lang.Long.parseLong(Long.java:601) ~[na:1.8.0_111]
at java.lang.Long.valueOf(Long.java:803) ~[na:1.8.0_111]
at
//more....
The solution is to exclude Springfox-Swagger's Swagger-Models jar package from pom.xml and reintroduce it as follows:
<!-- https://mvnrepository.com/artifact/io.springfox/springfox-swagger2 -->
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
<exclusions>
<exclusion>
<groupId>io.swagger</groupId>
<artifactId>swagger-models</artifactId>
</exclusion>
</exclusions>
</dependency>
<!-- https://mvnrepository.com/artifact/io.swagger/swagger-models -->
<dependency>
<groupId>io.swagger</groupId>
<artifactId>swagger-models</artifactId>
<version>1.5.21</version>
</dependency>
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