Issue
Following example project a:
project-a
-src/main/
-java/
-test/
-Test.java
module-info.java
-resources
...
pom.xml
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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>test</groupId>
<artifactId>test1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>javax.json</groupId>
<artifactId>javax.json-api</artifactId>
<version>1.1.4</version>
</dependency>
<dependency>
<groupId>org.glassfish</groupId>
<artifactId>javax.json</artifactId>
<version>1.1.4</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<release>11</release>
</configuration>
</plugin>
</plugins>
</build>
</project>
module-info.java:
module test1 {
exports test;
requires transitive java.json;
}
when I run eclipse [project > maven > update project], all dependencies are added to the classpath.
but the artifact javax.json-api
must be on the modulepath (the api is a module), the other on the classpath (the implementation of that api is not a module).
How do I do this?
(I am using Eclipse 2018-12, OpenJDK 11 and maven 3.6.0)
Example code of class Test:
package test;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;
import javax.json.Json;
import javax.json.JsonObjectBuilder;
import javax.json.JsonStructure;
import javax.json.JsonWriter;
import javax.json.JsonWriterFactory;
import javax.json.stream.JsonGenerator;
public class Test {
public static void main(String[] args) {
JsonObjectBuilder b = build("name", "FOO", "surname", "BAR");
String s = toFormattedString(b.build());
System.out.println(s);
}
public static String toFormattedString(JsonStructure json) {
Map<String, Boolean> config = new HashMap<String, Boolean>();
config.put(JsonGenerator.PRETTY_PRINTING, true);
JsonWriterFactory writerFactory = Json.createWriterFactory(config);
StringWriter writer = new StringWriter();
JsonWriter jsonwriter = writerFactory.createWriter(writer);
jsonwriter.write(json);
return writer.getBuffer().toString();
}
public static JsonObjectBuilder build(Object... objs) {
JsonObjectBuilder b = Json.createObjectBuilder();
for (int i = 0; i < objs.length - 1; i += 2) {
String name = (String) objs[i];
Object obj = objs[i + 1];
if (obj == null) {
b.addNull(name);
} else if (obj instanceof String) {
b.add(name, (String) obj);
} else if (obj instanceof Integer) {
b.add(name, (int) obj);
} else if (obj instanceof Double) {
b.add(name, (double) obj);
} else if (obj instanceof Long) {
b.add(name, (long) obj);
} else {
throw new IllegalArgumentException("Value type not supported:" + obj + " [class=" + obj.getClass() + "]");
}
}
return b;
}
}
Solution
I couldn't recreate your issue. In general, Eclipse puts modules on the module path which are required in module-info.java
. So, most of the time you don't even need to care about this.
In your case, I see a different issue. Two jar files javax.json-api
and javax.json
have the same module name and share the same packages. javax.json-api
is an explicit module (with module-info.java
). javax.json
is an automatic module (no module-info.java
). I don't know how Java will handle this but this is not a good situation certainly. I recommend fixing this issue first (e.g. merge modules or use classpath instead of a module path).
Answered By - ZhekaKozlov
Answer Checked By - Timothy Miller (JavaFixing Admin)