# \[R2\] Technical Service Logging (TSL)

**Issue** To find performance and throughput bottlenecks it is a good start to measure the time execution of methods and persist this information so it can be monitored over time.

**Solution** This kind of logging is addressed with Technical Service Logging (TSL). A particular log appender is used to capture the `MEASURED` logs and forward to a dedicated logfile with the file extension `.tslog`.

TSL can be turned on by setting the log level of the `MEASURED` category to `INFO` or higher. The logs must be send to a predefined appender with name `TSL`:

```xml
<logger name="MEASURED" level="OFF">

    <appender-ref ref="TSL"/>

</logger>
```

Like all other logs also the TSL is tenant-aware and a log file is written for each tenant. The log looks like:

```text
spGZLZ COMMON-Service 2019-05-03 11:43:30.080  DEBUG  [35m[63638/4] [0;39m  [2m- [0;39m [SERVICE_LAYER_ACCESS                    ] : [S]>> Method call: execution(TransportUnitServiceImpl.create(..))

spGZLZ COMMON-Service 2019-05-03 11:43:45.098  DEBUG  [35m[63638/1] [0;39m  [2m- [0;39m [SERVICE_LAYER_ACCESS                    ] : [S]<< execution(TransportUnitServiceImpl.create(..)) took [16] (ms)
```

If you want to see the TSL on the console instead then just refer to `STDOUT` instead of `TSL`:

```xml
<logger name="MEASURED" level="INFO">

    <appender-ref ref="TSL"/>

    <appender-ref ref="STDOUT"/>

</logger>
```

# \[R1\] Doing Tomcat URL Encoding right

**Problem** Incoming http requests with URL parameters or request body data aren’t encoded correctly - even the request is decoded right. For example a request parameter that is decoded to %E6%8C could be encoded to æŒ but not to the expected String.

**Solution** By default, Tomcat uses ISO-8859-1 character encoding. The HTTP Connector in Tomcat’s server configuration must be configured to set the URL encoding to UTF-8. Open the server’s server.xml, search for the http connector and add the attribute &quot;URIEncoding&quot; as follows:

```xml
<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" URIEncoding="UTF-8"/>
```