which class contains the logic for handling environment variables

[mitht]

I want to directly embed some custom configurations into the source code of opentelemetry-java-instrumentation. I couldn't find any code handling environment variables in the opentelemetry-java-instrumentation/instrumentation/resources package. Could you please inform me where the code for handling environment variables is located?

The configuration added in the io.opentelemetry.instrumentation.resources.ProcessResource class does not take effect.

[laurit]

RuntimeMXBean.getSystemProperties() copies the system properties to a new map, modifying it won't help at all. The conventional way for programmatically setting a system property would be to use https://docs.oracle.com/javase/8/docs/api/java/lang/System.html#setProperty-java.lang.String-java.lang.String- Though you shouldn't use that either. See

opentelemetry-java-instrumentation/examples/extension/src/main/java/com/example/javaagent/DemoAutoConfigurationCustomizerProvider.java

Lines 49 to 56 in b1e4c32

	private Map<String, String> getDefaultProperties() {
	Map<String, String> properties = new HashMap<>();
	properties.put("otel.exporter.otlp.endpoint", "http://backend:8080");
	properties.put("otel.exporter.otlp.insecure", "true");
	properties.put("otel.config.max.attrs", "16");
	properties.put("otel.traces.sampler", "demo");
	return properties;
	}