Unable to execute 'doFinal' with cipher instance [javax.crypto.Cipher@4e025e0a]

org.apache.shiro.crypto.CryptoException: Unable to execute 'doFinal' with cipher instance [javax.crypto.Cipher@4e025e0a].
    at org.apache.shiro.crypto.JcaCipherService.crypt(JcaCipherService.java:462)
    at org.apache.shiro.crypto.JcaCipherService.crypt(JcaCipherService.java:445)
    at org.apache.shiro.crypto.JcaCipherService.decrypt(JcaCipherService.java:390)
    at org.apache.shiro.crypto.JcaCipherService.decrypt(JcaCipherService.java:382)
    at org.apache.shiro.mgt.AbstractRememberMeManager.decrypt(AbstractRememberMeManager.java:482)
    at org.apache.shiro.mgt.AbstractRememberMeManager.convertBytesToPrincipals(AbstractRememberMeManager.java:419)
    at org.apache.shiro.mgt.AbstractRememberMeManager.getRememberedPrincipals(AbstractRememberMeManager.java:386)
    at org.apache.shiro.mgt.DefaultSecurityManager.getRememberedIdentity(DefaultSecurityManager.java:604)
    at org.apache.shiro.mgt.DefaultSecurityManager.resolvePrincipals(DefaultSecurityManager.java:492)
    at org.apache.shiro.mgt.DefaultSecurityManager.createSubject(DefaultSecurityManager.java:342)
    at org.apache.shiro.subject.Subject$Builder.buildSubject(Subject.java:846)
    at org.apache.shiro.web.subject.WebSubject$Builder.buildWebSubject(WebSubject.java:148)
    at org.apache.shiro.web.servlet.AbstractShiroFilter.createSubject(AbstractShiroFilter.java:292)
    at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:359)
    at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1747)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: javax.crypto.BadPaddingException: Given final block not properly padded. Such issues can arise if a bad key is used during decryption.
    at com.sun.crypto.provider.CipherCore.unpad(CipherCore.java:975)
    at com.sun.crypto.provider.CipherCore.fillOutputBuffer(CipherCore.java:1056)
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:853)
    at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)
    at javax.crypto.Cipher.doFinal(Cipher.java:2164)
    at org.apache.shiro.crypto.JcaCipherService.crypt(JcaCipherService.java:459)
    ... 35 more

每次登陆都会报这个错误，尝试了很多次都没解决，代码重编译后清除浏览器cookie登陆就会出现这个报错，虽然不影响登陆但是看着很不爽！！！！

问题产生的原因是rememberMe的cookie在第二次打开页面后shiro无法解密，经过查询资料以及代码跟踪发现了原因所在

先附上rememberMe管理器配置

    @Bean
    public CookieRememberMeManager cookieRememberMeManager() {
        CookieRememberMeManager cookieRememberMeManager = new CookieRememberMeManager();
        SimpleCookie simpleCookie = new SimpleCookie("rememberMe");
        simpleCookie.setMaxAge(259200000);
        cookieRememberMeManager.setCookie(simpleCookie);
        return cookieRememberMeManager;
    }

然后跟踪管理器源码发现，rememberMeManager继承了AbstractRememberMeManager，然而AbstractRememberMeManager的构造方法中每次都会重新生成对称加密密钥！！！！意味着每次重启程序都会重新生成一对加解密密钥！！！

    public AbstractRememberMeManager() {
        this.serializer = new DefaultSerializer<PrincipalCollection>();
        AesCipherService cipherService = new AesCipherService();
        this.cipherService = cipherService;
        setCipherKey(cipherService.generateNewKey().getEncoded());
    }

    public void setCipherKey(byte[] cipherKey) {
        //Since this method should only be used in symmetric ciphers
        //(where the enc and dec keys are the same), set it on both:
        setEncryptionCipherKey(cipherKey);
        setDecryptionCipherKey(cipherKey);
    }

这就会导致了，第一次启动程序shiro使用A密钥加密了cookie，第二次启动程序shiro重新生成了密钥B，当用户访问页面时，shiro会用密钥B去解密上一次用密钥A加密的cookie，导致解密失败，导致报错，所以这不影响用户登录操作(rememberMe失效罢了)，所以这种异常只会在程序重启(shiro清除session)第一次打开页面的时候出现

解决办法：

既然每次重启都会重新生成一对密钥，那我们就手动设置一个加解密密钥，主动设置cipherkey！！xml配置方式

    <bean id="rememberMeManager" class="org.apache.shiro.web.mgt.CookieRememberMeManager">
        <property name="cipherKey" value="#{T(org.apache.shiro.codec.Base64).decode('6ZmI6I2j5Y+R5aSn5ZOlAA==')}"/>
        <property name="cookie" ref="rememberCookie"/>     
    </bean>