Lambda in Java - Could not analyze lambda code

Question

I’ve got an application with Hibernate (JPA) which I am using in combination with Jinq. I’ve got a table which lists entities and I want the user to be able to filter it. In the table there are persons listed.

@Entity
public class Person {
    private String firstName;
    private String surName;
    @Id
    private int id;
    public Person() {
    }
    public Person(final String pFirstName, final String pSurName, final int pID) {
        firstName = pFirstName;
        surName = pSurName;
        id = pID;
    }
    public int getId() {
        return id;
    }
    public void setId(final int pID) {
        id = pID;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(final String pFirstName) {
        return firstName = pFirstName;
    }
    public String getSurName() {
        return surName;
    }
    public void setSurName(final String pSurName) {
        surName = pSurName;
    }
}

I am using JavaFX for this, but this shouldn’t matter. First thing I tried was to filter the persons by their surname. For filtering, I used Jinq in combination with lambda. My filtering code looks like this:

private List<Person> getFilteredPersons(final String pSurName){
    JPAJinqStream<Person> stream = streamProvider.streamAll(Person.class);
    stream.where(person -> person.getSurName().contains(pSurName));
    List<Person> filteredList = stream.toList();
    stream.close();
    return filteredList;
}

So the object I am operating on is a normal String. I don’t think that my Person class has anything to do with that. My first thought was, that you can’t use the method boolean contains(...) in lambda because when the error showed up, it said:

Caused by: java.lang.IllegalArgumentException: Could not analyze lambda code

So my question is, is it somehow possible to use the contains-method of a String in lambdacode?

Answer 1

Your question has nothing to do with JPA or lambdas, but everything to do with jinq: it simply doesn't support translating String.contains() to a database query. See http://www.jinq.org/docs/queries.html#N65890 for what is supported.