bcprov-jdk14、15on、16冲突，导致的签名不匹配。GeneralDigest signer information does not match

今天在迁移一个项目，结果成功启动，但是在登录的时候，提示如下错误！翻译发现是因为签名不匹配。百度说是因为jar包冲突了。

java.lang.SecurityException: class “org.bouncycastle.crypto.digests.GeneralDigest”'s signer information does not match signer information of other classes in the same package

1. 原来这个resources下面的libs中我手动导入了这个bcprov-jdk16-145.jar。
   
2. 删除16版本后，再次build，启动项目发现还是不行。在外部库中查找，果然有冲突的。
   
3. 用gradle下help的dependencies来分析一下。结果在tencentyun:tls-sig-api包中依赖了bcpkix-jdk15on，在org.xhtmlrenderer:flying-saucer-pdf中依赖了bouncycastle:bcprov-jdk14。那么我们排除org.xhtmlrenderer:flying-saucer-pdf中的bouncycastle:bcprov-jdk14。
   

+--- com.github.tencentyun:tls-sig-api:1.2
|    +--- org.bouncycastle:bcpkix-jdk15on:1.59
|    |    --- org.bouncycastle:bcprov-jdk15on:1.59
|    +--- org.bouncycastle:bcprov-jdk15on:1.59
|    --- org.json:json:20180130
+--- org.xhtmlrenderer:flying-saucer-pdf:9.0.3
|    +--- com.lowagie:itext:2.1.7
|    |    +--- bouncycastle:bcmail-jdk14:138
|    |    +--- bouncycastle:bcprov-jdk14:138
|    |    --- bouncycastle:bctsp-jdk14:138
|    |         --- org.bouncycastle:bctsp-jdk14:1.38
|    |              --- org.bouncycastle:bcmail-jdk14:1.38
|    --- org.xhtmlrenderer:flying-saucer-core:9.0.3

4. 修改build.gradle

compile('org.xhtmlrenderer:flying-saucer-pdf:9.0.3'){
     exclude group: 'bouncycastle', module: 'bcprov-jdk14'
     exclude group: 'org.bouncycastle', module: 'bcprov-jdk14'
 }