in src/main/java/org/apache/commons/logging/impl/LogFactoryImpl.java [1348:1362]
public void setAttribute(final String name, final Object value) {
if (logConstructor != null) {
logDiagnostic("setAttribute: call too late; configuration already performed.");
}
if (value == null) {
attributes.remove(name);
} else {
attributes.put(name, value);
}
if (name.equals(TCCL_KEY)) {
useTCCL = value != null && Boolean.parseBoolean(value.toString());
}
}