Java Stream：类 java.util.LinkedHashMap 不能转换为类 RealmRole

Question

In my springboot project I have a module named

model

Here I have a class RealmRole:

public class RealmRole {

private String id;
private String name;

public RealmRole() {
}

public String getId() {
    return id;
}

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

public String getName() {
    return name;
}

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

@Override
public String toString() {
    return "RealmRole{" +
            "id='" + id + '\'' +
            ", name='" + name + '\'' +
            '}';
}

}

From a request I get a

List<RealmRole>

Now I want to filter a RealmRole by name:

realmRoleList.stream().filter(realmRole.getName().equals("user")).forEach(sout)

This causes the error:

Message: class java.util.LinkedHashMap cannot be cast to class de.test.userregistration.model.RealmRole (java.util.LinkedHashMap is in module java.base of loader 'bootstrap'; de.test.userregistration.model.RealmRole is in unnamed module of loader 'app')

Even if I just try:

realmRoleList.stream().forEach(sout) I get the same error.

I've alread read some questions but I could not find an answer for this issue. I already removed devtools from pom.xml because I've read that this could lead to classloader problems.

Answer 1

最后使用此 'collect(Collectors.toList())' 将结果转换回列表。