使用JAXB的XSD到Java的多级导入失败

Question

I am facing an issue while creating Java classes from XSD using JAXB2.

please let me know if JAXB can handle this.

Scenario:

1) Project A has a.xsd and b.xsd with different name-spaces b.xsd uses a.xsd with import name-space tag.

2) Project B has c.xsd and uses b.xsd by importing b.xsd .
Catalog is being used by c.xsd to find the b.xsd in the Maven JAR which is added as a dependency.

ISSUE :

Project A builds fine but Project B throws error as it could not find a.xsd which is internally used by b.xsd.

ERROR

[ERROR] Error while parsing schema(s).Location [ http://www.example.com/test2/test2.xsd {15,39}]. org.xml.sax.SAXParseException; systemId: http://www.example.com/test2/test2.xsd ; lineNumber: 15; columnNumber: 39; src-resolve: Cannot resolve the name 'addme:address' to a(n) 'element declaration' component. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)

Project A

a.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.example.com/address" xmlns="http://www.example.com/address"
    elementFormDefault="qualified">
    <xs:element name="address">

        <xs:complexType>
            <xs:sequence>
                <xs:element name="street" type="xs:string" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

</xs:schema>

b.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.example.com/test2"
    xmlns="http://www.example.com/test2"
    xmlns:addme="http://www.example.com/address"
    elementFormDefault="qualified">

    <xs:import namespace="http://www.example.com/address" schemaLocation="http://www.example.com/address/address.xsd"/>

    <xs:element name="test2">
       <xs:complexType>
            <xs:sequence>
                <xs:element ref="addme:address" />
            </xs:sequence>
        </xs:complexType>
     </xs:element>

</xs:schema>

Project B

c.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xs:schema targetNamespace="http://www.example.com/customer"
    xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns="http://www.example.com/customer"
    xmlns:test="http://www.example.com/test2" elementFormDefault="qualified">

    <xs:import namespace="http://www.example.com/test2"
        schemaLocation="http://www.example.com/test2/test2.xsd" />

    <xs:element name="customer">
        <xs:complexType>
            <xs:sequence>
                <xs:element ref="test:test2" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>

</xs:schema>

catalog file for project B

REWRITE_SYSTEM " http://www.example.com/test2 " "maven:com.test.projectA:projectA:jar::!"

Project A POM snippet

<?xml version="1.0"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xs="http://www.w3.org/2001/XMLSchema"
    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">

    <properties>
        <xsd.build.dir>${basedir}/src/main/resources</xsd.build.dir>
        <generated.source.location>${basedir}/target/generated-sources/src</generated.source.location>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.jvnet.jaxb2_commons</groupId>
            <artifactId>jaxb2-basics</artifactId>
            <version>0.6.4</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.jvnet.jaxb2.maven2</groupId>
                <artifactId>maven-jaxb2-plugin</artifactId>
                <version>0.13.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <generateDirectory>${generated.source.location}</generateDirectory>
                    <schemaDirectory>${xsd.build.dir}</schemaDirectory>
                    <episode>true</episode>
                    <addIfExistsToEpisodeSchemaBindings>true</addIfExistsToEpisodeSchemaBindings>
                    <plugins>
                        <plugin>
                            <groupId>org.jvnet.jaxb2_commons</groupId>
                            <artifactId>jaxb2-basics</artifactId>
                            <version>0.6.4</version>
                        </plugin>
                    </plugins>
                    <args>
                        <arg>-XtoString</arg>
                        <arg>-Xequals</arg>
                        <arg>-XhashCode</arg>
                    </args>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-source-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>jar</goal>
                            <goal>test-jar</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>attach-sources</id>
                        <phase>DISABLE_FORKED_LIFECYCLE_MSOURCES-13</phase>
                    </execution>
                </executions>
            </plugin>

        </plugins>

    </build>
</project>

**PROJECT B POM** 

        <?xml version="1.0"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" .>

    <properties>
        <xsd.build.dir>${basedir}/src/main/resources</xsd.build.dir>
        <generated.source.location>${basedir}/target/generated-sources/src</generated.source.location>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.test.projectA</groupId>
            <artifactId>projectA</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.jvnet.jaxb2_commons</groupId>
            <artifactId>jaxb2-basics</artifactId>
            <version>0.6.4</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.jvnet.jaxb2.maven2</groupId>
                <artifactId>maven-jaxb2-plugin</artifactId>
                <version>0.13.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <generateDirectory>${generated.source.location}</generateDirectory>
                    <schemaDirectory>${xsd.build.dir}</schemaDirectory>
                    <catalog>src/main/resources/catalog.cat</catalog>
                    <useDependenciesAsEpisodes>true</useDependenciesAsEpisodes>
                    <plugins>
                        <plugin>
                            <groupId>org.jvnet.jaxb2_commons</groupId>
                            <artifactId>jaxb2-basics</artifactId>
                            <version>0.6.4</version>
                        </plugin>
                    </plugins>
                    <args>
                        <arg>-XtoString</arg>
                        <arg>-Xequals</arg>
                        <arg>-XhashCode</arg>
                    </args>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-source-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>jar</goal>
                            <goal>test-jar</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>attach-sources</id>
                        <phase>DISABLE_FORKED_LIFECYCLE_MSOURCES-13</phase>
                    </execution>
                </executions>
            </plugin>
        </plugins>

    </build>
</project>

Answer 1

Your catalog file needs to rewrite the locations of both xsds:

REWRITE_SYSTEM "http://www.example.com/test2/test2.xsd" "maven:com.test.projectA:projectA:jar::!/b.xsd"
REWRITE_SYSTEM "http://www.example.com/address/address.xsd" "maven:com.test.projectA:projectA:jar::!/a.xsd"

Note that these are rewrite rules, not PUBLIC rules. The left hand side of each entry is the systemLocation used in the xsds, not the namespace. PUBLIC rules won't work for you because your xsds specify a systemLocation , and there's a bug in xjc that prevents PUBLIC rules from working when a systemLocation is specified.

Also check that your xsds are being copied to the root of the published jar, and that their names match the ones used in the catalog.

Reference: Using-Catalogs