在Spring Boot项目中对Jasypt进行集成，当生成密码之后，启动程序抛如下异常：
com.ulisesbocchio.jasyptspringboot.exception.DecryptionException: Unable to decrypt。
完整异常信息如下：
Caused by: com.ulisesbocchio.jasyptspringboot.exception.DecryptionException: Unable to decrypt: ENC(/AL9nJENCYCh9Pfzdf2xLPsqOZ6HwNgQ3AnMybFAMeOM5GphZlOK6PxzozwtCm+Q). Decryption of Properties failed, make sure encryption/decryption passwords match at com.ulisesbocchio.jasyptspringboot.resolver.DefaultPropertyResolver.lambda$resolvePropertyValue$0(DefaultPropertyResolver.java:46) ~[jasypt-spring-boot-3.0.3.jar:na] at java.util.Optional.map(Optional.java:215) ~[na:1.8.0_151] at com.ulisesbocchio.jasyptspringboot.resolver.DefaultPropertyResolver.resolvePropertyValue(DefaultPropertyResolver.java:40) ~[jasypt-spring-boot-3.0.3.jar:na] at com.ulisesbocchio.jasyptspringboot.resolver.DefaultLazyPropertyResolver.resolvePropertyValue(DefaultLazyPropertyResolver.java:50) ~[jasypt-spring-boot-3.0.3.jar:na] at com.ulisesbocchio.jasyptspringboot.EncryptablePropertySource.getProperty(EncryptablePropertySource.java:20) ~[jasypt-spring-boot-3.0.3.jar:na] at com.ulisesbocchio.jasyptspringboot.caching.CachingDelegateEncryptablePropertySource.getProperty(CachingDelegateEncryptablePropertySource.java:41) ~[jasypt-spring-boot-3.0.3.jar:na] at com.ulisesbocchio.jasyptspringboot.wrapper.EncryptableMapPropertySourceWrapper.getProperty(EncryptableMapPropertySourceWrapper.java:31) ~[jasypt-spring-boot-3.0.3.jar:na] at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:85) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:62) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.core.env.AbstractEnvironment.getProperty(AbstractEnvironment.java:588) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:137) ~[spring-context-5.3.8.jar:5.3.8] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:133) ~[spring-context-5.3.8.jar:5.3.8] at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:85) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.core.env.PropertySourcesPropertyResolver.getPropertyAsRawString(PropertySourcesPropertyResolver.java:74) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:159) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.3.8.jar:5.3.8] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:936) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1321) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.annotation.Injectionmetadata.inject(Injectionmetadata.java:119) ~[spring-beans-5.3.8.jar:5.3.8] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.8.jar:5.3.8] ... 69 common frames omitted Caused by: org.jasypt.exceptions.EncryptionOperationNotPossibleException: null at org.jasypt.encryption.pbe.StandardPBEByteEncryptor.decrypt(StandardPBEByteEncryptor.java:1165) ~[jasypt-1.9.3.jar:na] at org.jasypt.encryption.pbe.StandardPBEStringEncryptor.decrypt(StandardPBEStringEncryptor.java:738) ~[jasypt-1.9.3.jar:na] at org.jasypt.encryption.pbe.PooledPBEStringEncryptor.decrypt(PooledPBEStringEncryptor.java:511) ~[jasypt-1.9.3.jar:na] at com.ulisesbocchio.jasyptspringboot.encryptor.DefaultLazyEncryptor.decrypt(DefaultLazyEncryptor.java:57) ~[jasypt-spring-boot-3.0.3.jar:na] at com.ulisesbocchio.jasyptspringboot.resolver.DefaultPropertyResolver.lambda$resolvePropertyValue$0(DefaultPropertyResolver.java:44) ~[jasypt-spring-boot-3.0.3.jar:na] ... 94 common frames omitted
针对此问题，原有可能有三个：
- 第一，的确是密码错误，也就是生成的密码由于不完整等原因，导致无法解密。此时重新生成密码，再试一试；
- 第二，加密算法问题，比如不同版本的Jasypt的加密算法是有所区别的，默认采用的加密算法与你生成密码的加密算法是否一致。如果不一致，那肯定无法进行解密；
- 第三，JDK没有安装不限长度的JCE版本（Unlimited Strength Java Cryptography Extension）。这种情况需要检查一下本地$JAVA_HOME/jre/lib/security目录下是否包含local_policy.jar和US_export_policy.jar量个jar包。如果没有，则进行添加。
第三种情况，所需的jar包可通过Oracle官网进行下载，下载地址：http://blog.didispace.com/spring-boot-learning-2x/
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