程序员经验分享-hwhale

如何使用 JAXB 和 spring-boot 将 XML 转换为字符串？

2024-02-23

当我运行mvn spring-boot:run在包含 pom.xml 文件的文件夹上，应用程序启动并将 POJO 正确序列化为 XML，但是当我通过转到目标文件夹并使用以下命令启动它时java -jar在我得到的jar文件中javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath引起的.java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory.

在我的 Maven 中，我有以下 JAXB 依赖项：

<!-- JAXB API -->
<dependency>
    <groupId>jakarta.xml.bind</groupId>
    <artifactId>jakarta.xml.bind-api</artifactId>
</dependency>

<!-- JAXB Runtime -->
<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.3.5</version>
    <scope>runtime</scope>
</dependency>

下面是将 POJO 序列化为 XML 的代码：

private static final Pattern REMOVE_HEADER = Pattern.compile("\\<\\?xml(.+?)\\?\\>");

public static <T> String toXML(final T data) {
    try {
        final var jaxbMarshaller = JAXBContext.newInstance(data.getClass()).createMarshaller();
        jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        final var sw = new StringWriter();
        jaxbMarshaller.marshal(data, sw);
        return XMLUtils.REMOVE_HEADER.matcher(sw.toString()).replaceAll("").strip();
    } catch (final JAXBException e) {
        XMLUtils.LOGGER.error("Error while converting POJO to XML. ERROR: {}.", e.getMessage(), e);
    }

    return "";
}

这是我使用 java -jar 启动应用程序时的日志：

2021-12-26 21:19:14,526 [ForkJoinPool.commonPool-worker-11] ERROR com.enterprise.system.shared.util.XMLUtils - Error while converting POJO to XML. ERROR: Implementation of JAXB-API has not been found on module path or classpath..
javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
 - with linked exception:
[java.lang.ClassNotFoundException: com.sun.xml.bind.v2.ContextFactory]
        at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:232)
        at javax.xml.bind.ContextFinder.find(ContextFinder.java:375)
        at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:691)
        at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:632)
        at com.enterprise.system.shared.util.XMLUtils.toXML(XMLUtils.java:26)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
        at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:720)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
        at java.base/java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:952)
        at java.base/java.util.stream.ReduceOps$ReduceTask.doLeaf(ReduceOps.java:926)
        at java.base/java.util.stream.AbstractTask.compute(AbstractTask.java:327)
        at java.base/java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:746)
        at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
        at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
        at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
        at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
        at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183)
Caused by: java.lang.ClassNotFoundException: com.sun.xml.bind.v2.ContextFactory
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
        at javax.xml.bind.ServiceLoaderUtil.nullSafeLoadClass(ServiceLoaderUtil.java:92)
        at javax.xml.bind.ServiceLoaderUtil.safeLoadClass(ServiceLoaderUtil.java:125)
        at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:230)
        ... 17 more

Here's an image of the generated spring-boot fat jar with the JAXB dependencies: JAXB dependencies

这是我的依赖树：

--- maven-dependency-plugin:3.2.0:tree (default-cli) @ java-eleven-jaxb-hell ---
com.enterprise.system:java-eleven-jaxb-hell:jar:0.0.1-SNAPSHOT
+- org.slf4j:slf4j-log4j12:jar:1.7.32:compile (optional)
|  +- org.slf4j:slf4j-api:jar:1.7.32:compile (optional)
|  \- log4j:log4j:jar:1.2.17:compile (optional)
+- org.springframework.boot:spring-boot-autoconfigure:jar:2.6.2:compile
|  \- org.springframework.boot:spring-boot:jar:2.6.2:compile
|     +- org.springframework:spring-core:jar:5.3.14:compile
|     |  \- org.springframework:spring-jcl:jar:5.3.14:compile
|     \- org.springframework:spring-context:jar:5.3.14:compile
|        +- org.springframework:spring-aop:jar:5.3.14:compile
|        +- org.springframework:spring-beans:jar:5.3.14:compile
|        \- org.springframework:spring-expression:jar:5.3.14:compile
+- org.projectlombok:lombok:jar:1.18.22:provided
+- jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.3:compile
|  \- jakarta.activation:jakarta.activation-api:jar:1.2.2:compile
\- com.sun.xml.bind:jaxb-impl:jar:2.3.5:runtime
   \- com.sun.activation:jakarta.activation:jar:1.2.2:runtime

最后，这是我的模型类：

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@XmlRootElement(name = "finans")
@XmlAccessorType(XmlAccessType.FIELD)
@Data
@NoArgsConstructor
@AllArgsConstructor
public class FinanTokenDTO {

    @XmlAttribute
    private String pln;

    @XmlAttribute
    private String ope;

    @XmlAttribute
    private String mod;

    @XmlAttribute
    private String mis;

    @XmlAttribute
    private String val;

    @XmlAttribute
    private String car;

    @XmlAttribute
    private String dti;

    @XmlAttribute
    private String dtf;

    @XmlAttribute
    private String ota;

    @XmlElement
    private FinanDTO finan;

}

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@XmlRootElement(name = "finan")
@XmlAccessorType(XmlAccessType.FIELD)
@Data
@NoArgsConstructor
@AllArgsConstructor
public class FinanDTO {

    @XmlAttribute
    private String prd;

    @XmlAttribute
    private String pkg;

    @XmlAttribute
    private String val;

    @XmlAttribute
    private String fty;

}

我正在使用 java 11，并且我知道在 java 11 中 JAXB 已从 SE JDK 中删除，因为它被视为 EE 功能。

我无法使用它来执行它mvn spring-boot:run在生产环境中，由于 docker 镜像的大小以及使用 docker 容器的安全相关问题。

由于 Spring Boot 生成一个 fat jar，应用程序不应该运行java -jar应用于 spring boot fat jar 生成的文件，方式与它相同mvn spring-boot:run在 pom.xml 文件夹内？

EDIT:

经过大量的挖掘和测试，我发现当我们尝试使用以下命令来编组多个有效的 POJO 时，就会出现问题并行流 https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#parallelStream()代替stream https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#stream()在 POJO 列表中。我将代码上传到java-11-jaxb-hell https://gitlab.com/Gioseffi/java-eleven-jaxb-hell为了更好地理解，不幸的是我无法改变并行流 https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#parallelStream() to stream https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Collection.html#stream()因为性能问题。请记住，要使问题发生，您必须运行java -jar针对 spring-boot 在目标文件夹中生成的 fat jar。


尝试添加下一个依赖项：

<dependency>
    <groupId>jakarta.xml.bind</groupId>
    <artifactId>jakarta.xml.bind-api</artifactId>
    <version>2.3.1</version>
</dependency>
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系:hwhale#tublm.com(使用前将#替换为@)

Spring

springboot

JAXB

JAVA11

如何使用 JAXB 和 spring-boot 将 XML 转换为字符串？ 的相关文章

随机推荐

热门标签