jodd-jtx/src/main/java/jodd/jtx/JtxTransactionManager.java
protected JtxTransaction propNever(JtxTransaction currentTx, final JtxTransactionMode mode, final Object scope) {
		if ((currentTx != null) && (!currentTx.isNoTransaction())) {
			throw new JtxException("Existing TX found for TX marked with propagation 'never'");
		}
		if (currentTx == null) {
			currentTx = createNewTransaction(mode, scope, false);
		}
		return currentTx;
	}
protected JtxTransaction propNever(JtxTransaction currentTx, final JtxTransactionMode mode, final Object scope) {
		if ((currentTx != null) && (!currentTx.isNoTransaction())) {
			throw new JtxException("Existing TX found for TX marked with propagation 'never'");
		}
		if (currentTx == null) {
			currentTx = createNewTransaction(mode, scope, false);
		}
		return currentTx;
	}
Propagation: NEVER
<pre>{@code
None -> None
T1   -> Error
}</pre>