[英]Maven Jaxb2 xjc plugin error No schemas have been found
這些天我花了一些時間在 JAXB 上,將 XSD 轉換為 Java Class,反之亦然。 這里有一個非常適合初學者的教程, http://www.journaldev.com/1312/how-to-generate-java-classes-from-xsd-using-xjc-maven-plugin 。 我嚴格按照步驟操作,但是mvn clean install
時總是報錯
這是我的pom.xml
文件。
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>jd</groupId>
<artifactId>jd</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<build>
<plugins>
<!-- Plugin required to build java classes from XSD using XJC -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>xjc</id>
<goals>
<goal>xjc</goal>
</goals>
</execution>
</executions>
<configuration>
<!-- The name of your generated source package -->
<arguments>-extension -npa -b ${project.basedir}/src/main/java/com/moodys/jaxb/global.xjb</arguments>
</configuration>
</plugin>
</plugins>
</build>
</project>
但是當我輸入mvn clean install
時,它總是給我如下錯誤:
C:\Users\congy\Desktop\Work\workspace\JaxbFromClass>mvn clean jaxb2:xjc
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building jd 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.4.1:clean (default-clean) @ jd ---
[INFO] Deleting C:\Users\congy\Desktop\Work\workspace\JaxbFromClass\target
[INFO]
[INFO] --- jaxb2-maven-plugin:1.5:xjc (default-cli) @ jd ---
[INFO] Generating source...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.487s
[INFO] Finished at: Thu Jul 04 19:09:37 CST 2013
[INFO] Final Memory: 4M/122M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:jaxb2-maven-plugin:1.5:xjc (default-cli) on project jd: No schemas have been found -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
任何人都可以告訴我原因或簡單地告訴我我應該參考什么以獲得更多信息嗎?
另一個問題是:根據這個問題Difference of Maven JAXB plugins ,至少有三個 jaxb 插件。 那么所有這些插件都是為了相同的目的而生成的嗎? 如果是這樣,為什么?
提前致謝!
由於您未提供任何schemaDirectory
,因此插件嘗試從默認架構目錄中的所有XML架構文件生成Java源代碼。 您應該根據文檔配置插件:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>id1</id>
<goals>
<goal>xjc</goal>
</goals>
<configuration>
<outputDirectory>target/generated-sources/jaxb</outputDirectory>
<packageName>com.your.package.jaxb</packageName>
<schemaDirectory>src/main/xsd</schemaDirectory>
<schemaFiles>jaxb.xsd</schemaFiles>
</configuration>
</execution>
</executions>
</plugin>
嘗試確保jrcb.xsd存在於src / main / resources下 ,插件正在加密,因為它無法在指定位置找到該方案。
我們可以在pom.xml文件中使用如下
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxb2-maven-plugin</artifactId>
<version>1.5</version>
<executions>
<execution>
<id>id1</id>
<goals>
<goal>xjc</goal>
</goals>
<configuration>
<outputDirectory>src/main/java</outputDirectory>
<clearOutputDir>false</clearOutputDir>
<packageName>com.subu.xsd.model</packageName>
<schemaDirectory>src/main/java/schemadir</schemaDirectory>
<schemaFiles>XYZ.xsd</schemaFiles>
</configuration>
</execution>
</executions>
</plugin>
OP 已經得到了他們的答案,但我出於不同的原因遇到了同樣的問題......
我介紹了一個新的 class,JAXB 沒有為其生成源代碼。 這是因為我使用了參數化構造函數。 一旦我添加了一個無參數構造函數,問題就解決了。
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