This SDK allows Dynatrace customers to instrument java applications. This is useful to enhance the visibility for proprietary frameworks or custom frameworks not directly supported by Dynatrace OneAgent out-of-the-box.
This is the official Java implementation of the Dynatrace OneAgent SDK.
samples: contains sample application, which demonstrates the usage of the SDK. See readme inside the samples directory for more details.docs: contains the reference documentation (javadoc). The most recent version is also available online at https://dynatrace.github.io/OneAgent-SDK-for-Java/.LICENSE: license under which the whole SDK and sample applications are published.| OneAgent SDK for Java | Required OneAgent version | Support status |
|---|---|---|
| 1.9.0 | >=1.261 | Supported |
| 1.8.0 | >=1.201 | Supported |
| 1.7.0 | >=1.167 | Deprecated with support ending 2023-09-01 |
| 1.6.0 | >=1.161 | Deprecated with support ending 2023-09-01 |
| 1.4.0 | >=1.151 | Deprecated with support ending 2023-09-01 |
| 1.3.0 | >=1.149 | Deprecated with support ending 2023-09-01 |
| 1.2.0 | >=1.147 | Deprecated with support ending 2023-09-01 |
| 1.1.0 | >=1.143 | Deprecated with support ending 2023-09-01 |
| 1.0.3 | >=1.135 | Deprecated with support ending 2023-09-01 |
If you want to integrate the OneAgent SDK into your application, just add the following Maven dependency:
<dependency>
<groupId>com.dynatrace.oneagent.sdk.java</groupId>
<artifactId>oneagent-sdk</artifactId>
<version>1.9.0</version>
<scope>compile</scope>
</dependency>If you prefer to integrate the SDK using plain jar file, just download them from Maven Central, e.g. from https://central.sonatype.com/artifact/com.dynatrace.oneagent.sdk.java/oneagent-sdk/1.9.0/versions.
The Dynatrace OneAgent SDK for Java has no further dependencies.
If the SDK can't connect to the OneAgent (see usage of SDKState in samples) or you you don't see the desired result in the Dynatrace UI, you can set the following system property to print debug information to standard out:
-Dcom.dynatrace.oneagent.sdk.debug=trueAdditionally you should/have to ensure, that you have set a LoggingCallback. For usage see class StdErrLoggingCallback in
remotecall-server module (in samples/remotecall folder).
Common concepts of the Dynatrace OneAgent SDK are explained in the Dynatrace OneAgent SDK repository.
Use OneAgentSDKFactory.createInstance() to obtain an OneAgentSDK instance. You should reuse this object throughout the whole application and, if possible, JVM lifetime:
OneAgentSDK oneAgentSdk = OneAgentSDKFactory.createInstance();
switch (oneAgentSdk.getCurrentState()) {
case ACTIVE:
break;
case PERMANENTLY_INACTIVE:
break;
case TEMPORARILY_INACTIVE:
break;
default:
break;
}It is good practice to check the SDK state regularly as it may change at any point in time (except for PERMANENTLY_INACTIVE, which never changes throughout the JVM lifetime).
An instance of the OneAgentSDK can be used to get the current ITraceContextInfo which holds information
about the Trace-Id and Span-Id of the current PurePath node.
This information can then be used to provide e.g. additional context in log messages.
Please note that TraceContextInfo is not intended for tagging or context-propagation use cases.
Dedicated APIs (e.g. remote calls or web requests) as well as
built-in OneAgent sensors take care of linking services correctly.
TraceContextInfo traceContextInfo = oneAgentSdk.getTraceContextInfo();
String traceId = traceContextInfo.getTraceId();
String spanId = traceContextInfo.getSpanId();
System.out.printf("[!dt dt.trace_id=%s,dt.span_id=%s] sending request... have trace ctx: %s%n",
traceId, spanId, traceContextInfo.isValid());To trace any kind of call you first need to create a Tracer. The Tracer object represents the logical and physical endpoint that you want to call. A Tracer serves two purposes. First, to time the call (duration, cpu and more) and report errors. That is why each Tracer has these three methods. The error method must be called only once, and it must be in between start and end.
A Tracer instance can only be used from the thread on which it was created. See in process linking for tracing across thread boundaries, and see further below in this section for how to cross process boundaries.
void start();
void error(String message);
void end();start() records the active PurePath node on the current Java thread
as parent (if any; whether created by another Tracer or the OneAgent), creates a new PurePath node
and sets the new one as the currently active one. The OneAgent also requires that a child node ends
before all parent nodes (Stated another way, tracers on the same thread must be ended in the opposite
order of how they were started. While this may sound odd if you hear it the first time, it corresponds
to the most natural usage pattern and you usually don't even need to think about it).
While the tracer's automatic parent-child relationship works very intuitively in most cases, it does not work with asynchronous patterns, where the same thread handles multiple logically separate operations in an interleaved way on the same Java thread. If you need to instrument such patterns, it is recommended to use the OneAgent's OpenTelemetry interoperability.
The second purpose of a Tracer is to allow tracing across process boundaries. To achieve that these kind of traces supply so called tags. Tags are strings or byte arrays that enable Dynatrace to trace a transaction end to end. As such the tag is the one information that you need to transport across these calls as an SDK user.
The feature sets differ slightly with each language implementation. More functionality will be added over time, see Planned features for OneAgent SDK for details on upcoming features.
A more detailed specification of the features can be found in Dynatrace OneAgent SDK.
| Feature | Required OneAgent SDK for Java version |
|---|---|
| Trace context for log enrichment | >=1.9.0 |
| Custom services | >=1.8.0 |
| Trace database requests | >=1.7.0 |
| Trace messaging | >=1.6.0 |
| Outgoing web requests | >=1.4.0 |
| Incoming web requests | >=1.3.0 |
| Custom request attributes | >=1.2.0 |
| In process linking | >=1.1.0 |
| Trace incoming and outgoing remote calls | >=1.0.3 |
You can use the SDK to trace proprietary IPC communication from one process to the other. This will enable you to see full Service Flow, PurePath and Smartscape topology for remoting technologies that Dynatrace is not aware of.
To trace any kind of remote call you first need to create a Tracer. The Tracer object represents the endpoint that you want to call, as such you need to supply the name of the remote service and remote method. In addition you need to transport the tag in your remote call to the server side if you want to trace it end to end.
OneAgentSDK oneAgentSdk = OneAgentSDKFactory.createInstance();
OutgoingRemoteCallTracer outgoingRemoteCall = oneAgentSdk.traceOutgoingRemoteCall("remoteMethodToCall", "RemoteServiceName", "rmi://Endpoint/service", ChannelType.TCP_IP, "remoteHost:1234");
outgoingRemoteCall.setProtocolName("RMI/custom");
outgoingRemoteCall.start();
try {
String tag = outgoingRemoteCall.getDynatraceStringTag();
// make the call and transport the tag across to server
} catch (Throwable e) {
outgoingRemoteCall.error(e);
// rethrow or add your exception handling
} finally {
outgoingRemoteCall.end();
}On the server side you need to wrap the handling and processing of your remote call as well. This will not only trace the server side call and everything that happens, it will also connect it to the calling side.
OneAgentSDK oneAgentSdk = OneAgentSDKFactory.createInstance();
IncomingRemoteCallTracer incomingRemoteCall = oneAgentSdk.traceIncomingRemoteCall("remoteMethodToCall", "RemoteServiceName", "rmi://Endpoint/service");
incomingRemoteCall.setDynatraceStringTag(tag);
incomingRemoteCall.start();
try {
incomingRemoteCall.setProtocolName("RMI/custom");
doSomeWork(); // process the remoteCall
} catch (Exception e) {
incomingRemoteCall.error(e);
// rethrow or add your exception handling
} finally{
incomingRemoteCall.end();
}You can use the SDK to link inside a single process. To link for eg. an asynchronous execution, you need the following code:
OneAgentSDK oneAgentSdk = OneAgentSDKFactory.createInstance();
InProcessLink inProcessLink = oneAgentSdk.createInProcessLink();Provide the returned inProcessLink to the code, that does the asynchronous execution:
OneAgentSDK oneAgentSdk = OneAgentSDKFactory.createInstance();
InProcessLinkTracer inProcessLinkTracer = oneAgentSdk.traceInProcessLink(inProcessLink);
inProcessLinkTracer.start();
try {
// do the work ...
} catch (Exception e) {
inProcessLinkTracer.error(e);
// rethrow or add your exception handling
} finally {
inProcessLinkTracer.end();
}You can use the SDK to add custom request attributes to the current traced service. Custom request attributes allow you to do advanced filtering of your requests in Dynatrace.
Adding custom request attributes to the currently traced service call is simple. Just call one of the addCustomRequestAttribute methods with your key and value:
oneAgentSDK.addCustomRequestAttribute("region", "EMEA");
oneAgentSDK.addCustomRequestAttribute("salesAmount", 2500);When no service call is being traced, the custom request attributes are dropped.
You can use the SDK to trace custom service methods. A custom service method is a meaningful part of your code that you want to trace but that does not fit any other tracer. An example could be the callback of a periodic timer.
String serviceMethod = "onTimer";
String serviceName = "PeriodicCleanupTask";
CustomServiceTracer tracer = oneAgentSDK.traceCustomService(serviceMethod, serviceName);
tracer.start();
try {
doMyCleanup();
} catch (Exception e) {
tracer.error(e.getMessage());
throw e;
} finally {
tracer.end();
}You can use the SDK to trace incoming web requests. This might be useful if Dynatrace does not support the respective web server framework or language processing the incoming web requests.
To trace an incoming web request you first need to create a WebApplicationInfo object. The info object represents the endpoint of your web server (web server name, application name and context root). This object should be reused for all traced web requests within for the same application.
WebApplicationInfo wsInfo = oneAgentSdk.createWebApplicationInfo("WebShopProduction", "CheckoutService", "/api/service/checkout");To trace a specific incoming web request you then need to create a Tracer object. Make sure you provide all http headers from the request to the SDK by calling addRequestHeader(...). This ensures that tagging with our built-in sensor will work, but note that only the proprietary x-dynatrace header will be processed (meaning, W3C trace context is not supported for tracing with the OneAgent SDKs, use OpenTelemetry instead if you require this).
IncomingWebRequestTracer tracer = oneAgentSdk.traceIncomingWebRequest(wsInfo,"https://www.oursupershop.com/api/service/checkout/save", "POST")
for (Entry<String, String> headerField : httpRequest.getHeaders().entrySet()) {
tracer.addRequestHeader(headerField.getKey(), headerField.getValue());
}
for (Entry<String, List<String>> parameterEntry : httpRequest.getParameters().entrySet()) {
for (String value : parameterEntry.getValue()) {
tracer.addParameter(parameterEntry.getKey(), value);
}
}
tracer.setRemoteAddress(httpRequest.getRemoteHostName());
tracer.start();
try {
int statusCodeReturnedToClient = processWebRequest();
tracer.setStatusCode(statusCodeReturnedToClient);
} catch (Exception e) {
tracer.setStatusCode(500); // we expect that the container sends HTTP 500 status code in case request processing throws an exception
tracer.error(e);
throw e;
} finally {
tracer.end();
}You can use the SDK to trace outgoing web requests. This might be useful if Dynatrace does not support the respective http library or language sending the request.
To trace an outgoing web request you need to create a Tracer object. It is important to send the Dynatrace Header. This ensures that tagging with our built-in sensor will work.
OutgoingWebRequestTracer outgoingWebRequestTracer = oneAgentSdk.traceOutgoingWebRequest(url, "GET");
// provide all request headers to outgoingWebRequestTracer (optional):
for (Entry<String, String> entry : yourHttpClient.getRequestHeaders().entrySet()) {
outgoingWebRequestTracer.addRequestHeader(entry.getKey(), entry.getValue());
}
outgoingWebRequestTracer.start();
try {
yourHttpClient.setUrl(url);
// sending HTTP header OneAgentSDK.DYNATRACE_HTTP_HEADERNAME is necessary for tagging:
yourHttpClient.addRequestHeader(OneAgentSDK.DYNATRACE_HTTP_HEADERNAME, outgoingWebRequestTracer.getDynatraceStringTag());
yourHttpClient.processHttpRequest();
for (Entry<String, List<String>> entry : yourHttpClient.getHeaderFields().entrySet()) {
for (String value : entry.getValue()) {
outgoingWebRequestTracer.addResponseHeader(entry.getKey(), value);
}
}
outgoingWebRequestTracer.setStatusCode(yourHttpClient.getResponseCode());
} catch (Exception e) {
outgoingWebRequestTracer.error(e);
// rethrow or add your exception handling
} finally {
outgoingWebRequestTracer.end();
}You can use the SDK to trace messages sent or received via messaging & queuing systems. When tracing messages, we distinguish between:
To trace an outgoing message, you simply need to create a MessagingSystemInfo and call traceOutgoingMessage with that instance:
MessagingSystemInfo messagingSystemInfo = oneAgentSDK.createMessagingSystemInfo("myMessagingSystem",
"requestQueue", MessageDestinationType.QUEUE, ChannelType.TCP_IP, "localhost:4711");
OutgoingMessageTracer outgoingMessageTracer = oneAgentSDK.traceOutgoingMessage(messagingSystemInfo);
outgoingMessageTracer.start();
try {
// transport the dynatrace tag along with the message:
messageToSend.setHeaderField(
OneAgentSDK.DYNATRACE_MESSAGE_PROPERTYNAME, outgoingMessageTracer.getDynatraceStringTag());
// optional: add application provided correlationId
outgoingMessageTracer.setCorrelationId(toSend.correlationId);
theQueue.send(messageToSend);
// optional: add messageid provided from messaging system
outgoingMessageTracer.setVendorMessageId(toSend.getMessageId());
} catch (Exception e) {
outgoingMessageTracer.error(e.getMessage());
// rethrow or add your exception handling
} finally {
outgoingMessageTracer.end();
}On the incoming side, we need to differentiate between the blocking receiving part and processing the received message. Therefore two
different tracers are being used: IncomingMessageReceiveTracer and IncomingMessageProcessTracer.
MessagingSystemInfo messagingSystemInfo = oneAgentSDK.createMessagingSystemInfo("myMessagingSystem",
"requestQueue", MessageDestinationType.QUEUE, ChannelType.TCP_IP, "localhost:4711");
// message receiving daemon task:
while(true) {
IncomingMessageReceiveTracer incomingMessageReceiveTracer =
oneAgentSDK.traceIncomingMessageReceive(messagingSystemInfo);
incomingMessageReceiveTracer.start();
try {
// blocking call - until message is being available:
Message queryMessage = theQueue.receive("client queries");
IncomingMessageProcessTracer incomingMessageProcessTracer = oneAgentSDK
.traceIncomingMessageProcess(messagingSystemInfo);
incomingMessageProcessTracer.setDynatraceStringTag(
queryMessage.getHeaderField(OneAgentSDK.DYNATRACE_MESSAGE_PROPERTYNAME));
incomingMessageProcessTracer.setVendorMessageId(queryMessage.msgId);
incomingMessageProcessTracer.setCorrelationId(queryMessage.correlationId);
incomingMessageProcessTracer.start();
try {
// do the work ...
} catch (Exception e) {
incomingMessageProcessTracer.error(e.getMessage());
Logger.logError(e);
} finally {
incomingMessageProcessTracer.end();
}
} catch (Exception e) {
incomingMessageReceiveTracer.error(e.getMessage());
// rethrow or add your exception handling
} finally {
incomingMessageReceiveTracer.end();
}
}In case of non-blocking receive (e. g. via event handler), there is no need to use IncomingMessageReceiveTracer - just trace processing
of the message by using the IncomingMessageProcessTracer:
MessagingSystemInfo messagingSystemInfo = oneAgentSDK.createMessagingSystemInfo("myMessagingSystem",
"requestQueue", MessageDestinationType.QUEUE, ChannelType.TCP_IP, "localhost:4711");
public void onMessage(Message message) {
IncomingMessageProcessTracer incomingMessageProcessTracer = oneAgentSDK
.traceIncomingMessageProcess(messagingSystemInfo);
incomingMessageProcessTracer.setDynatraceStringTag((String)
message.getObjectProperty(OneAgentSDK.DYNATRACE_MESSAGE_PROPERTYNAME));
incomingMessageProcessTracer.setVendorMessageId(queryMessage.msgId);
incomingMessageProcessTracer.setCorrelationId(queryMessage.correlationId);
incomingMessageProcessTracer.start();
try {
// do the work ...
} catch (Exception e) {
incomingMessageProcessTracer.error(e.getMessage());
// rethrow or add your exception handling
} finally {
incomingMessageProcessTracer.end();
}
}Please also see the documentation on messaging tracers in the specification repository.
A SQL database request is traced by calling traceSqlDatabaseRequest. For details about usage see the OneAgentSDK specification
String sql = "SELECT * FROM transformationdata WHERE transformation_id = " + id;
DatabaseInfo databaseInfo = oneAgentSdk.createDatabaseInfo("TransformationDb", DatabaseVendor.FIREBIRD.getVendorName(), ChannelType.TCP_IP, "db-serv01.acme.com:2323");
DatabaseRequestTracer databaseTracer = oneAgentSdk.traceSqlDatabaseRequest(databaseInfo, sql);
databaseTracer.start();
try {
Result result = executeTheDatabaseCall(sql);
databaseTracer.setReturnedRowCount(result.getRows().getLength());
} catch (InterruptedException e) {
databaseTracer.error(e);
// handle or rethrow
} finally {
databaseTracer.end();
}Please note that SQL database traces are only created if they occur within some other SDK trace (e.g. incoming remote call) or a OneAgent built-in trace (e.g. incoming web request).
The Dynatrace OneAgent SDK for Java has GA status. The features are fully supported by Dynatrace.
For detailed support policy see Dynatrace OneAgent SDK help.
Open a GitHub issue to:
SLAs don't apply for GitHub tickets
Customers can open a ticket on the Dynatrace support portal to:
SLAs apply according to the customer's support level.
See https://github.com/Dynatrace/OneAgent-SDK-for-Java/releases for older release notes.