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Improve diagnostics for failed container startup #11998

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Improve diagnostics for failed container startup #11998

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088f161
Improve diagnostics for failed container startup
vpelikh Jun 30, 2026
59357a7
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vpelikh Aug 28, 2026
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25 changes: 20 additions & 5 deletions core/src/main/java/org/testcontainers/containers/GenericContainer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -495,7 +495,10 @@ private void tryStart() {
}

if (inspectContainerResponse == null) {
throw new IllegalStateException("Wait strategy failed. Container is removed", e);
throw new IllegalStateException(
"Wait strategy failed. Container " + containerId + " is removed",
e
);
}

InspectContainerResponse.ContainerState state = inspectContainerResponse.getState();
Expand Down Expand Up @@ -538,14 +541,26 @@ private void tryStart() {

if (containerId != null) {
// Log output if startup failed, either due to a container failure or exception (including timeout)
final String containerLogs = getLogs();

if (containerLogs.length() > 0) {
String containerLogs = null;
try {
containerLogs = getLogs();
} catch (NotFoundException e2) {
logger().error("Could not retrieve logs for container {}: container not found", containerId, e2);
} catch (Exception e2) {
logger().error("Could not retrieve logs for container {}", containerId, e2);
}
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if (containerLogs != null && !containerLogs.isEmpty()) {
logger().error("Log output from the failed container:\n{}", containerLogs);
} else {
logger().error("There are no stdout/stderr logs available for the failed container");
}
stop();

String failedContainerId = containerId;
try {
stop();
} catch (Exception e2) {
logger().debug("Failed to stop container {}", failedContainerId, e2);
}
}

throw new ContainerLaunchException("Could not create/start container", e);
Expand Down