我尝试在 osgi 容器中运行 Hibernate validator 。

<dependency>
    <groupId>javax.el</groupId>
    <artifactId>javax.el-api</artifactId>
    <version>2.2.4</version>
</dependency>
<dependency>
    <groupId>org.glassfish.web</groupId>
    <artifactId>javax.el</artifactId>
    <version>2.2.4</version>
</dependency>

<dependency>
    <groupId>org.apache.servicemix.bundles</groupId>
    <artifactId>org.apache.servicemix.bundles.hibernate-validator</artifactId>
    <version>5.0.2.Final_1</version>
</dependency>

<dependency>
    <groupId>joda-time</groupId>
    <artifactId>joda-time</artifactId>
    <version>2.7</version>
</dependency>

<dependency>
    <groupId>org.jsoup</groupId>
    <artifactId>jsoup</artifactId>
    <version>1.8.1</version>
</dependency>


public class HibernateValidationProviderResolver implements ValidationProviderResolver {
    @Override
    public List<ValidationProvider<?>> getValidationProviders() {
        List<ValidationProvider<?>> list = new ArrayList<>(1);
        list.add(new HibernateValidator());
        return list;
    }
}


Configuration<?> configuration = Validation.byDefaultProvider().providerResolver(
    new HibernateValidationProviderResolver()
).configure();

ValidatorFactory validatorFactory = configuration.buildValidatorFactory();
Validator validator = validatorFactory.getValidator();
Set<ConstraintViolation<Group>> constraintViolations = validator.validate(group);


public class Group {
    @NotNull
    @Size(min=2)
    private String title;
}

尝试运行，equinox控制台没问题:

10      RESOLVED    org.glassfish.web.javax.el_2.2.4
39      RESOLVED    org.apache.servicemix.bundles.hibernate-validator_5.0.2.Final_1
47      RESOLVED    javax.validation.api_1.1.0.Final
49      RESOLVED    javax.el-api_2.2.4

如果我使用 title = null 传递 Group 类实例，则验证正常并且 constraintViolations 包含一个违规“not null”。 如果我通过 title = "A" 传递 Group 类实例(一个字符对最小长度 = 2)，那么它会抛出异常

Caused by: javax.el.ELException: Provider com.sun.el.ExpressionFactoryImpl not found
Caused by: java.lang.ClassNotFoundException: com.sun.el.ExpressionFactoryImpl

它 100% 是由 osgi 引起的，但是我应该如何在 osgi 中设置 hibernate-validator？我能找到的所有文章都描述了 HibernateValidationProviderResolver 的创建，仅此而已。

更新 1

Maven: javax.el:javax.el-api:2.2.4

Export-Package: javax.el;version="2.2.4"
Import-Package: javax.el;version="2.2.4"

Maven: org.glassfish.web:javax.el:2.2.4 MANIFEST.MF

Export-Package: com.sun.el;uses:="javax.el";version="2.2.4"
Private-Package: com.sun.el.lang;version="2.2.4",com.sun.el.parser;version="2.2.4",com.sun.el.util;version="2.2.4"
Import-Package: com.sun.el;version="2.2.4",javax.el;version="2.2"

Maven: org.apache.servicemix.bundles:org.apache.servicemix.bundles.hibernate-validator:5.0.2.Final_1

Implementation-Version: 5.0.2.Final
Import-Package: javax.el,javax.persistence;resolution:=optional, ...

Export-Package: org.hibernate.validator.internal.engine.messageinterpola
tion.el;uses:="javax.el,javax.validation,org.hibernate.validator.intern
al.engine.messageinterpolation";version="5.0.2.Final",org.hibernate.val
idator.internal.engine.messageinterpolation;uses:="javax.validation.met
adata,org.hibernate.validator.internal.engine.messageinterpolation.el,j
avax.el,javax.validation,org.hibernate.validator.internal.util.logging"
;version="5.0.2.Final", ...

在 hibernate bundle 中导入的任何版本，el-api 和 el-impl 导出中的 2.2.4 和 el-impl 将 el-api 导入为 2.2，而不是 2.2.4。所有 bundle 都已解析。

更新 2

决定 1

我对@hwellmann 想法的实现。 @hwellmann，对吗？

public void createGroup(Group group) {
    ClassLoader prevClassLoader = Thread.currentThread().getContextClassLoader();

    try {
        ClassLoader[] classLoaders = new ClassLoader[] {
            prevClassLoader,
            ExpressionFactoryImpl.class.getClassLoader()
        };

        // build composite classloader

        Thread.currentThread().setContextClassLoader(compositeClassLoader);

        Set<ConstraintViolation<Group>> constraintViolations = validator.validate(group);

    } finally {
        Thread.currentThread().setContextClassLoader(prevClassLoader);
    }
}

它有效但看起来很奇怪。在每个验证过程中更改 TCCL 看起来都是一些开销。

决定 2

当我将自己的消息属性添加到每个验证注释时，错误消失了，例如组:

public class Group {
    @NotNull
    @Size(min=2, message="field.too_short")
    private String title;
}

在这种情况下，hibernate 插值器似乎没有启动，所以 ExpressionFactoryImpl 没有从 TCCL 检索到(以前我们读取 min=2 值，现在我们不读取)。如果对我们来说没问题，这个决定是最简单的。 我将进一步调查这个领域并在那里分享我的观察结果。

最佳答案

JBoss Fuse 中有一个相关问题: https://access.redhat.com/solutions/1479723

他们建议降级到 4.3.1.Final:

<dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-validator</artifactId>
   <version>4.3.1.Final</version>
</dependency>

关于java - 在 osgi-container 中找不到 hibernate-validator 的 el 实现，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29678113/