Traccar Server Ubuntu Installation

Kyle 7 years ago

Hello all. I installed Traccar server on Ubuntu using the instructions here: https://www.traccar.org/install-digitalocean/

To start the server I run: /opt/traccar/bin/startDaemon.sh
The output from that command ends with: Service traccar started

However when I run: tail -f /opt/traccar/logs/wrapper.log.*
I see the following: INFO|wrapper|Service traccar|18-09-16 20:07:21|exit code posix process: 59136 application(status/signal): 231/0

Running the command 'service --status-all' shows the follow for Traccar: [ - ] traccar

Does anyone know what I can do to get the service started? My traccar.xml file looks like this:

<properties>

    <entry key="config.default">./conf/default.xml</entry>

    <entry key='web.port'>80</entry>

    <entry key='geocoder.enable'>false</entry>

    <entry key='database.driver'>com.mysql.jdbc.Driver</entry>
    <entry key='database.url'>jdbc:mysql://localhost/traccar?allowMultiQueries=true&amp;autoReconnect=true&amp;useUnicode=yes&amp;characterEncoding=UTF-$
    <entry key='database.user'>root</entry>
    <entry key='database.password'>******</entry>

    <entry key='server.timeout'>120</entry>

</properties>

Thanks for the help!

Kyle 7 years ago

I forgot to add that the output for MySQL in 'service --status-all' is: [ + ] mysql

I can also connect to the MySQL database via the command line.

Anton Tananaev 7 years ago

You need to properly check log files.

Kyle 7 years ago

The rest of the log file is as follows:

==> /opt/traccar/logs/wrapper.log.20180916 <==
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2037)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|	... 28 more
INFO|wrapper|Service traccar|18-09-16 20:07:21|waitpid 8783 59136
INFO|wrapper|Service traccar|18-09-16 20:07:21|exit code posix process: 59136 application(status/signal): 231/0

It looks to be that Traccar is trying to connect to MySQL but is unable to.

Anton Tananaev 7 years ago

No, that's not the rest of the log file. You need to look at the full file.

Kyle 7 years ago

Would it be in /opt/traccar/logs? If so, which file would it be?

Anton Tananaev 7 years ago

Same file.

Kyle 7 years ago

The following lines stood out to me:

INFO|8783/0|Service traccar|18-09-16 20:07:21|[main] ERROR com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Exception during pool initialization.
INFO|8783/0|Service traccar|18-09-16 20:07:21|com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
INFO|8783/0|Service traccar|18-09-16 20:07:21|Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost'

The full file is below:

WARNING|wrapper|Service traccar|18-09-16 20:07:12|YAJSW: yajsw-stable-12.12
WARNING|wrapper|Service traccar|18-09-16 20:07:12|OS   : Linux/4.15.0-30-generic/amd64
WARNING|wrapper|Service traccar|18-09-16 20:07:12|JVM  : Oracle Corporation/10.0.2//usr/lib/jvm/java-11-openjdk-amd64/64
INFO|wrapper|Service traccar|18-09-16 20:07:12|exec:java -classpath /opt/traccar/wrapperApp.jar:/opt/traccar/tracker-server.jar:/opt/traccar/lib/log4j-1.2.17.jar:/opt/traccar/lib/joda-time-2.10.jar:/opt/traccar/lib/co$
INFO|wrapper|Service traccar|18-09-16 20:07:12|posix_spawn pid 8783
INFO|wrapper|Service traccar|18-09-16 20:07:12|started process 8783
INFO|wrapper|Service traccar|18-09-16 20:07:12|started process with pid 8783
INFO|8783/0|Service traccar|18-09-16 20:07:14|[INFO] StandardFileSystemManager - Using "/tmp/vfs_cache" as temporary files store.
INFO|8783/0|Service traccar|18-09-16 20:07:15|SLF4J: Class path contains multiple SLF4J bindings.
INFO|8783/0|Service traccar|18-09-16 20:07:15|SLF4J: Found binding in [jar:file:/opt/traccar/lib/slf4j-simple-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
INFO|8783/0|Service traccar|18-09-16 20:07:15|SLF4J: Found binding in [jar:file:/opt/traccar/lib/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
INFO|8783/0|Service traccar|18-09-16 20:07:15|SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
INFO|8783/0|Service traccar|18-09-16 20:07:15|SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory]
INFO|8783/0|Service traccar|18-09-16 20:07:15|[main] INFO com.zaxxer.hikari.HikariDataSource - HikariPool-1 - Starting...
INFO|8783/0|Service traccar|18-09-16 20:07:16|Sun Sep 16 20:07:16 UTC 2018 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ re$
INFO|8783/0|Service traccar|18-09-16 20:07:21|[main] ERROR com.zaxxer.hikari.pool.HikariPool - HikariPool-1 - Exception during pool initialization.
INFO|8783/0|Service traccar|18-09-16 20:07:21|com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.Util.getInstance(Util.java:408)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:861)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2096)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2021)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:112)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:118)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:341)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:193)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:428)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:499)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:112)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:72)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.database.DataManager.initDatabase(DataManager.java:134)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.database.DataManager.<init>(DataManager.java:87)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.Context.init(Context.java:361)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.Main.main(Main.java:35)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/java.lang.reflect.Method.invoke(Method.java:564)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.rzo.yajsw.app.WrapperJVMMain.executeMain(WrapperJVMMain.java:60)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.rzo.yajsw.app.WrapperJVMMain.main(WrapperJVMMain.java:43)
INFO|8783/0|Service traccar|18-09-16 20:07:21|Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost'
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2037)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  ... 28 more
INFO|8783/0|Service traccar|18-09-16 20:07:21|java.lang.reflect.InvocationTargetException
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/java.lang.reflect.Method.invoke(Method.java:564)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.rzo.yajsw.app.WrapperJVMMain.executeMain(WrapperJVMMain.java:60)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.rzo.yajsw.app.WrapperJVMMain.main(WrapperJVMMain.java:43)
INFO|8783/0|Service traccar|18-09-16 20:07:21|Caused by: com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize pool: Could not create connection to database server. Attempted reconnect 3 $
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(HikariPool.java:528)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:520)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:112)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:72)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.database.DataManager.initDatabase(DataManager.java:134)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.database.DataManager.<init>(DataManager.java:87)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.Context.init(Context.java:361)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at org.traccar.Main.main(Main.java:35)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  ... 6 more
INFO|8783/0|Service traccar|18-09-16 20:07:21|Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.Util.getInstance(Util.java:408)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:898)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:887)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:861)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2096)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2021)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:112)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:118)
INFO|8783/0|Service traccar|18-09-16 20:07:21|  at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:341)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:193)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:428)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:499)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        ... 12 more
FINEST|8783/0|Service traccar|18-09-16 20:07:21|Caused by: java.sql.SQLException: Access denied for user 'root'@'localhost'
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:965)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1714)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1224)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2190)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        at com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2037)
FINEST|8783/0|Service traccar|18-09-16 20:07:21|        ... 28 more
INFO|wrapper|Service traccar|18-09-16 20:07:21|waitpid 8783 59136
INFO|wrapper|Service traccar|18-09-16 20:07:21|exit code posix process: 59136 application(status/signal): 231/0

Anton Tananaev 7 years ago

I think the error is pretty clear now:

Access denied for user 'root'@'localhost'

Try this command:

mysql -u root -p --execute="GRANT ALL PRIVILEGES on *.* to 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root'; FLUSH PRIVILEGES;"

If it doesn't help, you need to research on relevant MySQL resources about the problem.

Kyle 7 years ago

Thank you for your help with this. I am going to try this tonight and report back.

Kyle 7 years ago

I determined that the problem was me using the wrong password for root. I changed the password with:

mysql -u root -p
ALTER USER 'root'@'localhost' IDENTIFIED BY 'MyNewPass';

Now everything works as expected. Thank you for the assistance and for the hard work on this project!