在JDK11中运行jaxb2-maven-plugin（2.5.0）时出现错误。

pom.xml：

<plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>jaxb2-maven-plugin</artifactId>
            <executions>
                <execution>
                    <id>xjc_test</id>
                    <phase>generate-sources</phase>
                    <goals>
                        <goal>xjc</goal>
                    </goals>
                    <configuration>
                        <sources>
                            <source>../a/b/c/myschema.xsd</source>
                        </sources>
                        <clearOutputDir>false</clearOutputDir>
                        <outputDirectory />
                    </configuration>
                </execution>
            </executions>
</plugin>

错误：

 [ERROR] null [-1,-1] 
org.xml.sax.SAXParseException; schema_reference.4: Failed to read schema document 'file:/home/userE/eclipse-workspace-201809/parent/testjaxb/home/userE/eclipse-workspace-201809/parent/a/b/c/myschema.xsd',because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>
[ERROR] Failed to execute goal org.codehaus.mojo:jaxb2-maven-plugin:2.5.0:xjc (xjc_test) on project xxx:

[ERROR] +=================== [XJC Error]
[ERROR] |
[ERROR] | 0: file:/home/userE/eclipse-workspace-201809/parent/a/b/c/myschema.xsd
[ERROR] |
[ERROR] +=================== [End XJC Error]

如果我在pom.xml中输入了错误的源路径，它将失败，因此我可以假定它找到了正确的.xsd文件。 我不了解schema_reference，它来自哪里。

有关信息，我的.xsd看起来像：（他位于另一个项目中）

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    ...
</xs:schema>