Compile error if ID property is private and has no setter/getter

[longdw]

ObjectBox version: 1.4.4
Gradle tools version: 3.1.1
AndroidStudio version: 3.1.1

Manually Add Libraries

dependencies {
    implementation "io.objectbox:objectbox-android:1.4.4"
    annotationProcessor "io.objectbox:objectbox-processor:1.4.4"
}

When I add annotating one class with @entity, then I make project, the following error occurred:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:compileDebugJavaWithJavac'.
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
	at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
......

[greenrobot]

I have the impression, we're not seeing the relevant error info yet. Could you post more around that sniplet?

[longdw]

@greenrobot I create a simple project https://github.com/longdw/TestObjectBox,the same error has occurred.

[greenrobot-team]

Actual error (from Build tab):

Note: [ObjectBox] Starting ObjectBox processor (debug: false)
TestObjectBox-master\app\build\generated\source\apt\debug\com\test\objectbox\TestObjectCursor.java:44: error: cannot find symbol
        Long id = entity.getId();
                        ^
  symbol:   method getId()
  location: variable entity of type TestObject
TestObjectBox-master\app\build\generated\source\apt\debug\com\test\objectbox\TestObjectCursor.java:49: error: cannot find symbol
        entity.setId(__assignedId);
              ^
  symbol:   method setId(long)
  location: variable entity of type TestObject
TestObjectBox-master\app\build\generated\source\apt\debug\com\test\objectbox\TestObject_.java:89: error: cannot find symbol
            Long id = object.getId();
                            ^
  symbol:   method getId()
  location: variable object of type TestObject
3 errors
:app:compileDebugJavaWithJavac FAILED

@longdw As your id property is private Objectbox can not access it. So either

• make id at least package-private (@Id Long id;),
• or add a getter and setter:

public Long getId() {
    return id;
}

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

-ut

[greenrobot]

@greenrobot-team we should detect that scenario, report an error and hint at the two options.

[greenrobot-team]

The next version of the processor will cause an error with a helpful message if it is detected that the @Id property is not accessible. -ut

[greenrobot]

Check the 2.0.0 release.

[markdrake]

This issue was happening to me on version 2.3.3 using Kotlin, this was because I was using data classes like this:

data class Entity(@Id val id: Long)

just change it to:

data class Entity(@Id var id: Long)

and works like a charm.

[greenrobot-team]

@markdrake https://docs.objectbox.io/kotlin-support

-Uwe