Troubleshooting

Solutions for common issues with ObjectBox for Java and Dart

Unresolved reference: MyObjectBox (class not found, etc.)

MyObjectBox is a generated class, so make sure the project builds successfully. Resolve any other build errors.

Check that the project is configured correctly. E.g. for Kotlin, check that the kapt plugin is applied (apply plugin: 'kotlin-kapt') before the ObjectBox plugin.

android-apt is known to cause problems, try to remove it.

Merge conflict or DbSchemaException after concurrent data model modifications

If your team makes concurrent modifications to the data model (e.g. adding/removing entities or properties) it may clash with your changes. Read the meta model docs on how to resolve the conflicts.

DbSchemaException: incoming ID does not match existing UID

Creating a Store throws a DbSchemaException and a message like

• Incoming entity ID does not match existing UID

• Incoming property ID does not match existing UID

• Incoming index ID does not match existing UID

This means there is a conflict between the data model defined in your code (using @Entity classes) and the data model of the existing database file.

For example for an entity, this message indicates the unique identifier (UID) of an entity is not the same as before. Entity UIDs are auto-assigned by ObjectBox and stored in objectbox-models/default.json for Java or lib/objectbox-model.json for Dart. Look for the id property which contains the UID in the second part, the first part is the ID (the format is ID:UID).

Read the meta model docs on why this can happen and how to resolve such conflicts.

DbSchemaException after switching git branch (no concurrent data model modifications)

See below.

DbSchemaException: DB's last ID is higher

Creating a Store throws a DbSchemaException and a message like

• DB's last entity ID is higher than from model

• DB's last property ID is higher than the incoming one

• DB's last index ID is higher than from model

• DB's last relation ID is higher than from model

This means, there is a conflict between the data model defined in your code (using @Entity classes) and the data model of the existing database file.

For example for an entity, this message indicates that the database already contains one or more entities with IDs higher than the lowest one of the model in your code. Entity IDs are auto-assigned by ObjectBox and stored in objectbox-models/default.json for Java or lib/objectbox-model.json for Dart. Look for the lastEntityId value, the highest used entity ID is contained in the first part, the second part is the UID (the format is ID:UID).

Read the meta model docs on why this can happen and how to resolve such conflicts.

DbFullException: Could not put

This is thrown when applying a transaction (e.g. putting an object) would exceed the maxSizeInKByte (Java)/maxDBSizeInKB (Dart) configured for the store.

By default, this is 1 GB, which should be sufficient for most applications. In general, a maximum size prevents the database from growing indefinitely when something goes wrong (for example data is put in an infinite loop).

This value can be changed, so increased or also decreased, each time when opening a store:

Java

MyObjectBox.builder()
    .androidContext(context)
    .maxSizeInKByte(1024 * 1024 /* 1 GB */)
    .build()

Dart

Store(getObjectBoxModel(), maxDBSizeInKB: 1024 * 1024 /* 1 GB */);

Couldn’t find “libobjectbox.so”

This can have various reasons. In general check your ABI filter setup or add one in your Gradle build file.

If your app explicitly ships code for "armeabi": For Android, ObjectBox comes with binaries for “armeabi-v7a” and “arm64-v8a” ABIs. We consider “armeabi” to be outdated and thus do not support it. Check if you have a Gradle config like abiFilters "armeabi", which is causing the problem (e.g. remove it or change it to “armeabi-v7a”).

If your app uses split APKs or App Bundle: some users might have sideloaded your APK that includes the library for a platform that is incompatible with the one of their device. See App Bundle, split APKs and Multidex for workarounds.

Version conflict with ‘com.google.code.findbugs:jsr305’

If you are doing Android instrumentation (especially with Espresso), you may get a warning like this: Error:Conflict with dependency ‘com.google.code.findbugs:jsr305’ in project ‘:app’. Resolved versions for app (3.0.2) and test app (2.0.1) differ. See http://g.co/androidstudio/app-test-app-conflict for details.

You can easily resolve the version conflict by adding this Gradle dependency: androidTestCompile 'com.google.code.findbugs:jsr305:3.0.2'

Background info.

Incompatible property type

Check the data model migration guide if you get an exception like: io.objectbox.exception.DbException: Property […] is not compatible to its previous definition. Check its type.

or

Cannot change the following flags for Property

Flutter iOS builds for armv7 fail with "ObjectBox does not contain that architecture"

Only 64-bit iOS devices are supported. To resolve the build error, configure Architectures in your Xcode project like described in Getting Started for Flutter.

Error Codes

Sometimes you might get an error code along with a error message. Typically, you will find error codes in parenthesis. Example:

Could not prepare directory: objectbox (30)

This error code comes from the OS, and gives you additional information; e.g. 30 tells that you tried to init a database in a read-only location of the file system, which cannot work.

Here's the list of typical OS errors:

Error code	Errno	Description
1	EPERM	Operation not permitted
2	ENOENT	No such file or directory
3	ESRCH	No such process
4	EINTR	Interrupted system call
5	EIO	I/O error
6	ENXIO	No such device or address
7	E2BIG	Argument list too long
8	ENOEXEC	Exec format error
9	EBADF	Bad file number
10	ECHILD	No child processes
11	EAGAIN	Try again
12	ENOMEM	Out of memory
13	EACCES	Permission denied
14	EFAULT	Bad address
15	ENOTBLK	Block device required
16	EBUSY	Device or resource busy
17	EEXIST	File exists
18	EXDEV	Cross-device link
19	ENODEV	No such device
20	ENOTDIR	Not a directory
21	EISDIR	Is a directory
22	EINVAL	Invalid argument
23	ENFILE	File table overflow
24	EMFILE	Too many open files
25	ENOTTY	Not a typewriter
26	ETXTBSY	Text file busy
27	EFBIG	File too large
28	ENOSPC	No space left on device
29	ESPIPE	Illegal seek
30	EROFS	Read-only file system
31	EMLINK	Too many links
32	EPIPE	Broken pipe
33	EDOM	Math argument out of domain of func
34	ERANGE	Math result not representable

Help with other issues

FAQ

If you believe to have found a bug or missing feature, please create an issue.

For Java/Kotlin: https://github.com/objectbox/objectbox-java/issues

For Flutter/Dart: https://github.com/objectbox/objectbox-dart/issues

If you have a usage question regarding ObjectBox, please post on Stack Overflow. https://stackoverflow.com/questions/tagged/objectbox