我试着写一个程序，它只是检查一个增值税号码的有效性。我想在这里使用的web服务：https://ec.europa.eu/taxation_customs/vies/services/checkVatService.wsdl我遵循了这个教程（https://www.baeldung.com/java-soap-web-service），并得到maven生成一些类在我的项目中与以下pom.xml：

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.ffleuchten.vatchecker</groupId>
<artifactId>VatChecker</artifactId>
<version>0.0.1</version>
<dependencies>
    <dependency>
        <groupId>jakarta.xml.ws</groupId>
        <artifactId>jakarta.xml.ws-api</artifactId>
        <version>4.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.ws</groupId>
        <artifactId>jaxws-rt</artifactId>
        <version>4.0.0</version>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>com.sun.xml.ws</groupId>
        <artifactId>jaxws-ri</artifactId>
        <version>4.0.0</version>
        <type>pom</type>
    </dependency>
</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>com.sun.xml.ws</groupId>
            <artifactId>jaxws-maven-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <wsdlUrls>
                    <wsdlUrl>https://ec.europa.eu/taxation_customs/vies/services/checkVatService.wsdl</wsdlUrl>
                </wsdlUrls>
                <keep>true</keep>
                <packageName>com.ffleuchten.vatchecker.generated</packageName>
                <sourceDestDir>src/main/java</sourceDestDir>
            </configuration>
        </plugin>
    </plugins>
</build>

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生成的类如下：

-rw-r--r-- 1 manoca manoca 2.2K Nov 15 15:15 CheckVat.java
-rw-r--r-- 1 manoca manoca 6.8K Nov 15 15:15 CheckVatApprox.java
-rw-r--r-- 1 manoca manoca  13K Nov 15 15:15 CheckVatApproxResponse.java
-rw-r--r-- 1 manoca manoca 6.4K Nov 15 15:15 CheckVatPortType.java
-rw-r--r-- 1 manoca manoca 5.2K Nov 15 15:15 CheckVatResponse.java
-rw-r--r-- 1 manoca manoca 3.1K Nov 15 15:15 CheckVatService.java
-rw-r--r-- 1 manoca manoca 4.9K Nov 15 15:15 ObjectFactory.java
-rw-r--r-- 1 manoca manoca  221 Nov 15 15:16 package-info.java

型
生成这些类之后，就有点奇怪了，因为生成的import语句是错误的，生成了无效的导入，比如：

import javax.xml.ws.Service;

型
我让我的Eclipse改成了

import jakarta.xml.ws.Service;

型
进口
在那之后，一切都编译得很好，我做了这个类来尝试它：

package com.ffleuchten.vatchecker;

import java.time.LocalDate;

import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.XMLGregorianCalendar;

import com.ffleuchten.vatchecker.generated.CheckVatPortType;
import com.ffleuchten.vatchecker.generated.CheckVatService;

import jakarta.xml.ws.Holder;

public class TestVAT {

    private String countryCode;
    private String vatNumber;

    public TestVAT(String countryCode, String vatNumber) {
        this.countryCode = countryCode;
        this.vatNumber = vatNumber;
    }

    private void run() {
        try {
            System.out.println("checking VAT number "
                    .concat(this.vatNumber)
                    .concat(" with country code ")
                    .concat(this.countryCode)
                    .concat("..."));
            
            CheckVatService service = new CheckVatService();
            CheckVatPortType port = service.getCheckVatPort();
            
            Holder<String> countryCodeHolder = new Holder<String>(this.countryCode); 
            Holder<String> vatNumberHolder = new Holder<String>(this.vatNumber);  
            Holder<XMLGregorianCalendar> requestDateHolder = new Holder<XMLGregorianCalendar>(DatatypeFactory.newInstance().newXMLGregorianCalendar(LocalDate.now().toString()));
            Holder<Boolean> validHolder = new Holder<Boolean>(false); 
            Holder<String> nameHolder = new Holder<String>("?"); 
            Holder<String> adressHolder = new Holder<String>("?");
            
            port.checkVat(countryCodeHolder, vatNumberHolder, requestDateHolder, validHolder, nameHolder, adressHolder);
            
            System.out.println("VAT number "
                    .concat(vatNumberHolder.value)
                    .concat(" with country code ")
                    .concat(countryCodeHolder.value)
                    .concat(" is ")
                    .concat(validHolder.value.booleanValue() ? "valid" : "invalid")
                    .concat(" and belongs to ")
                    .concat(nameHolder.value)
                    .concat(" who lives at ")
                    .concat(adressHolder.value)
                    .concat("!"));
            
            System.out.println("VAT number checked! exiting now...");
            System.exit(0);
            
        } catch (DatatypeConfigurationException e) {
            e.printStackTrace();
            System.exit(1);
        }
        
    }
    
    public static void main(String[] args) {
        if(args.length < 1) {
            System.err.println("no country code passed as parameter!");
            System.exit(1);
        }
        if(args.length < 2) {
            System.err.println("no VAT number passed as parameter!");
            System.exit(1);
        }
        String countryCode = args[0];
        String vatNumber = args[1];
        new TestVAT(countryCode, vatNumber).run();
    }

}

型
它仍然可以编译甚至运行，但是无论我使用什么VAT号码和/或国家代码，我总是得到以下输出：

checking VAT number DE814416365 with country code DE...
VAT number DE814416365 with country code DE is invalid and belongs to --- who lives at ---!
VAT number checked! exiting now...

型
那么，是我在这里做错了什么，还是Web服务真的总是响应“VAT number is invalid”（增值税号码无效）（似乎是这样，因为它用"-“覆盖了名称和地址值）？