Jersey 2.1 - Consuming collection of POJO as JSON string - jersey

Question

I have a collection of entities (List) which I need to convert to/from json.
The POJO:
public class Task {
private Long id;
private String title;
private Boolean done;
(...)
}
Jersey produces the following result
[{"id":1,"title":"T1","done":false},{"id":2,"title":"T2","done":false}]
when I call the method:
#GET
#Override
#Produces("application/json")
public List<Task> findAll() {
(...)
return tasks;
}
So far so good.
Now, I need to consume a similar JSON string. I assumed that the following method would do the trick:
#PUT
#Consumes("application/json")
public void save(List<Task> tasks) {
(...)
}
But instead I get the error below:
SEVERE: line 1:0 no viable alternative at input
'"[{\"id\":1,\"title\":\"T1\",\"done\":true},{\"id\":2,\"title\":\"T2\",\"done\":false}]"'
What am I doing wrong? Is that even possible?
Jersey's dependencies:
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId>
<version>2.1</version>
</dependency>
Here is the web.xml configuration
<servlet>
<servlet-name>Jersey Servlet</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>my.rest.package</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey Servlet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>

Answer 1

It seems that you're sending corrupted JSON as entity in your message body, something like:
POST http://localhost:9998/test/list
Accept: application/json
Content-Type: application/json
"[{\"a\":\"a\",\"b\":1,\"c\":1}]"
I was able to get the same error as you with the entity like this (line 1:0 no viable alternative at input '"[{\"a\":\"a\",\"b\":1,\"c\":1}]"').
Make sure you're sending the valid JSON to your REST service, i.e. by registering a logging filter in your Application:
new ResourceConfig()
.packages("my.rest.package")
// Register logging filter and print entity.
.register(new LoggingFilter(LOGGER, true));

Answer 2

Alternatively, you can accept the incoming JSON as String and parse it within the method using any standard parser.
#PUT
public void save(String s) {
// parse s
}

Answer 3

Type parameters are not available after type erasure.
Try using array instead of list:
#PUT
#Consumes("application/json")
public void save(Task[] taskArray) {
List<Task> tasks = Arrays.asList(taskArray);
(...)
}