如何解决Camel3脂肪罐创建异常

Question

我使用Apache Camel 3.18.2 switch Camel-main。为了创建一个胖罐子，我在pom.xml中配置了以下两个插件：

<plugin>
<groupId>org.apache.camel</groupId>
<artifactId>camel-maven-plugin</artifactId>
<version>3.18.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>prepare-fatjar</goal>
</goals>
</execution>
</executions>
</plugin>

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>de.powerstat.camel.homeautomation.MainApp</mainClass>
</manifest>
</archive>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>

作为依赖：

<dependencies>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-core</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-main</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-netty</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-stream</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-paho</artifactId>
</dependency>
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-quartz</artifactId>
</dependency>
<dependency>
<groupId>de.powerstat.camel.component</groupId>
<artifactId>camel-fbaha</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>de.powerstat.camel.component</groupId>
<artifactId>camel-fbtr64</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.openmuc</groupId>
<artifactId>jsml</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.18.0</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.18.0</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>2.18.0</version>
<scope>runtime</scope>
</dependency>
</dependencies>

但在运行mvn干净安装过程中，我得到了：

[INFO] --- camel-maven-plugin:3.18.2:prepare-fatjar (default) @ myhome ---
[INFO] Found 5 Camel type converter loaders from project classpath
[INFO]
[INFO] --- maven-assembly-plugin:2.2-beta-5:single (make-assembly) @ myhome ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.2-beta-5:single (make-assembly) on project myhome: Error reading assemblies: No assembly descriptors found. -> [Help 1]
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
Exception in thread "ivy-httpclient-shutdown-handler" java.lang.NoClassDefFoundError: 
org/apache/http/impl/conn/PoolingHttpClientConnectionManager$2
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.shutdown(PoolingHttpClientConnectionManager.java:413)
at org.apache.http.impl.client.HttpClientBuilder$2.close(HttpClientBuilder.java:1244)
at org.apache.http.impl.client.InternalHttpClient.close(InternalHttpClient.java:201)
at org.apache.ivy.util.url.HttpClientHandler.close(HttpClientHandler.java:357)
at org.apache.ivy.util.url.HttpClientHandler$1.run(HttpClientHandler.java:84)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.ClassNotFoundException: org.apache.http.impl.conn.PoolingHttpClientConnectionManager$2
at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
... 6 more

在我看来，这是一个隐含的依赖项，camel-maven插件没有添加它。

所以我的问题是如何解决这个问题？

我还尝试使用maven shade插件，而不是maven汇编插件：

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.4.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<createDependencyReducedPom>true</createDependencyReducedPom>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
</plugin>

这会导致在执行过程中出现以下异常的胖罐子：

[ERROR] 2022-09-30T22:04:48,426 15612/22 org.apache.camel.processor.errorhandler.DefaultErrorHandler Failed delivery for (MessageId: 
08B251E5AD78E72-0000000000000000 on ExchangeId: 
08B251E5AD78E72-0000000000000000). Exhausted after     
delivery attempt: 1 caught: 
org.apache.camel.InvalidPayloadException: No body available of type: java.lang.Integer but has type: 
java.lang.String on: Message. Caused by: No type converter available to convert from type: java.lang.String to the required type: java.lang.Integer. Exchange[]. Caused by: 
[org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: 
java.lang.String to the required type: java.lang.Integer]

因此，看起来shade插件创建了一个胖罐子，但忽略了骆驼依赖性。

也许这可以用这样或那样的方式解决？

最后但同样重要的是，主要问题是如何创建一个完整且正确工作的Camel3脂肪罐？

Answer 1

基于错误消息

读取程序集时出错：找不到程序集描述符。

您似乎缺少程序集描述符。您需要定义描述符或描述符参考

descriptor示例：

<project>
[...]
<build>
[...]
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.4.2</version>
<configuration>
<descriptors>
<descriptor>src/assembly/src.xml</descriptor>
</descriptors>
</configuration>
[...]
</project>

descriptorRef示例：

<project>
[...]
<build>
[...]
<plugins>
<plugin>
<!-- NOTE: We don't need a groupId specification because the group is
org.apache.maven.plugins ...which is assumed by default.
-->
<artifactId>maven-assembly-plugin</artifactId>
<version>3.4.2</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
[...]
</project>

如果定义descriptor，请参阅有关描述符格式的内容。