How to POST complex Collection of objects from HTML Form to Jersey method

I'm struggling with Jersey parameter conversion. I've already tried all similar Q&A here in SO but nothing worked for me so far.

Here are my sources:

<!- HTML Form ->

<form action="/rest/0.1/object/save"
      enctype="application/x-www-form-urlencoded"
      method="POST">
    <input type="text" name="default_name" />

    <input type="hidden" name="object_translation[0][language_code]" value='en'>
    <input type="text" name="object_translation[0][name]">

    <input type="hidden" name="object_translation[1][language_code]" value="it">
    <input type="text" name="object_translation[1][name]">

    <input type="submit" />
</form>

---

//com.myobject.ws.MyResource.java
@POST
@Path("/save")
//@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
public Response saveObject(@FormDataParam("object_translation") List<List<BaseTranslationElement>> object_translation
) 
{
    System.out.println(object_translation);

    return Response.ok().build();
}

---

//BaseTranslationElement.java

package com.myobject.model;

import javax.ws.rs.ext.ParamConverter;

public class BaseTranslationElement //implements ParamConverter
{
    int id;
    String name;
    Language language;

    public BaseTranslationElement() {}

    public BaseTranslationElement(String name, Language language)
    {
        this.name = name;
        this.language = language;
    }

    public BaseTranslationElement(int id, String name, Language language)
    {
        this.id = id;
        this.name = name;
        this.language = language;
    }

    public static BaseTranslationElement valueOf(String toDecode)
    {

        return new BaseTranslationElement("name1", new Language("en", "LAAA"));
    }

    public int getId() { return id; }

    public void setId(int id) { this.id = id; }

    public String getName() { return name; }

    public void setName(String name) { this.name = name; }

    public Language getLanguage() { return language; }

    public void setLanguage(Language language) { this.language = language; }

/*    @Override
    public Object fromString(String value) { return null; }

    @Override
    public String toString(Object value) { return null; }*/
}

<!-- my pom.xml -->
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://ift.tt/IH78KX"
         xmlns:xsi="http://ift.tt/ra1lAU"
         xsi:schemaLocation="http://ift.tt/IH78KX http://ift.tt/VE5zRx">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.myobject</groupId>
    <artifactId>my-ws</artifactId>
    <version>1.0</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>jsr311-api</artifactId>
            <version>1.1.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.18.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-servlet</artifactId>
            <version>1.18.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.34</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.3.1</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>1.2.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.1.5.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.sun.jersey.contribs</groupId>
            <artifactId>jersey-multipart</artifactId>
            <version>1.19</version>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <version>2.0.1</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>my-ws</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.2</version>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

//Error in catalina.out during startup

INFORMAZIONI: Initiating Jersey application, version 'Jersey: 1.18.1 02/19/2014 03:28 AM' mar 01, 2015 4:32:34 PM com.sun.jersey.spi.inject.Errors processErrorMessages GRAVE: The following errors and warnings have been detected with resource and/or provider classes: SEVERE: Missing dependency for method public javax.ws.rs.core.Response com.myobject.ws.MyResource.saveObject(java.util.List) at parameter at index 0 SEVERE: Method, public javax.ws.rs.core.Response com.appappa.ws.MyResource.saveObject(java.util.List), annotated with GET of resource, class com.myobject.ws.MyResource, is not recognized as valid resource method.