java.lang.ClassFormatError：在类文件 javax/mail/MessagingException 中非本机或抽象的方法中缺少代码属性

Question

I have a maven dependency for javaee Bibliothek.

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>6.0</version>
    <scope>provided</scope>
</dependency>

I get the error in Eclipse in some classes.

java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/mail/MessagingException

I added javax.mail dependency.

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.5</version>
</dependency>

It did not not work. Any Idea??

Answer 1

It did not work because classes from javax/javaee-api/provided dependency are specially constructed. They are not usable runtime because implementation of methods is missing.

Simply adding classes from javax.mail/mail/1.4.5 dependency to the classpath does not help, because classes from javax/javaee-api/provided are already there. Having javax.mail/mail/1.4.5 dependecy alone solves your problem, but most likely you also need other classes from javax/javaee-api/provided .

What you can do is to get rid of javax/javaee-api/provided dependency and get these classes for example from the dependencies provided by target application server. You can use for example following:

   <dependency>
        <groupId>org.jboss.spec</groupId>
        <artifactId>jboss-javaee-6.0</artifactId>
        <version>1.0.0.Final</version>
        <type>pom</type>
        <scope>provided</scope>
     </dependency>

Because scope is provided, it does not affect the artifact to be built. That's why you can use this one also with other application servers than JBoss. It is same API as in your original dependency, but it contains normal classes.

Answer 2

Weird but the following order works for me,

    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4</version>
    </dependency>

    <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>6.0</version>
        <scope>provided</scope>
    </dependency>

The reverse won't work.

Answer 3

in my case, only use the library:

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4</version>
</dependency>

Run with JDK 6 and Tomcat without problems

Answer 4

如果您按以下顺序将它们添加到您的 pom 中：javax.mail javaee-web-api 它可以工作是非常合乎逻辑的，因为运行时首先从 javax.mail 找到必要的类（具有正确的实现），忽略任何类似的来自 javaee-web-api 的类（没有实现）。

Answer 5

In my case i use following order. Work very well with JDK6.

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4</version>
    <scope>provided</scope>
    <exclusions>
        <exclusion>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>javaee</groupId>
    <artifactId>javaee-api</artifactId>
    <version>5</version>
    <scope>provided</scope>
</dependency>