Mingyang.net：java.lang.NoSuchMethodError: javax.el.ExpressionFactory.newInstance()

使用hibernate-validator校验数据模型时报出如下异常：

java.lang.NoSuchMethodError: javax.el.ExpressionFactory.newInstance()Ljavax/el/ExpressionFactory;
    at org.hibernate.validator.internal.engine.messageinterpolation.InterpolationTerm.<clinit>(InterpolationTerm.java:59)
    at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.interpolateExpression(ResourceBundleMessageInterpolator.java:341)
    at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.interpolateMessage(ResourceBundleMessageInterpolator.java:279)
    at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.interpolate(ResourceBundleMessageInterpolator.java:194)
    at org.springframework.validation.beanvalidation.LocaleContextMessageInterpolator.interpolate(LocaleContextMessageInterpolator.java:50)
    at org.hibernate.validator.internal.engine.ValidationContext.interpolate(ValidationContext.java:362)
    at org.hibernate.validator.internal.engine.ValidationContext.createConstraintViolation(ValidationContext.java:271)
    at org.hibernate.validator.internal.engine.ValidationContext.createConstraintViolations(ValidationContext.java:232)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateSingleConstraint(ConstraintTree.java:291)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:133)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateComposingConstraints(ConstraintTree.java:233)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:102)
    at org.hibernate.validator.internal.engine.constraintvalidation.ConstraintTree.validateConstraints(ConstraintTree.java:91)
    at org.hibernate.validator.internal.metadata.core.MetaConstraint.validateConstraint(MetaConstraint.java:83)
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:547)
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForDefaultGroup(ValidatorImpl.java:487)
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:451)
    at org.hibernate.validator.internal.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:403)
    at org.hibernate.validator.internal.engine.ValidatorImpl.validate(ValidatorImpl.java:206)
    at org.springframework.validation.beanvalidation.SpringValidatorAdapter.validate(SpringValidatorAdapter.java:108)
    at org.springframework.validation.DataBinder.validate(DataBinder.java:760)
    ......

原因是如果想在消息中使用EL表达式，请确保EL表达式版本是 2.2或以上。我用的是Tomcat6，lib目录下的el-api.jar是2.1版本的，可以到Tomcat7拷贝一个。