[standalone@localhost:9990 /] /subsystem=transactions:write-attribute(name=default-timeout,value=0)
{
    "outcome" => "failed",
    "failure-description" => "WFLYCTL0158: Operation handler failed: java.lang.IllegalArgumentException: COM00001: Parameter 'newTimeout' must not be less than 1",
    "rolled-back" => true
}

ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 2) WFLYCTL0013: Operation ("write-attribute") failed - address: ([("subsystem" => "transactions")]): java.lang.IllegalArgumentException: COM00001: Parameter 'newTimeout' must not be less than 1
	at org.wildfly.common.Assert.checkMinimumParameter(Assert.java:133)
	at org.wildfly.transaction.client.ContextTransactionManager.setGlobalDefaultTransactionTimeout(ContextTransactionManager.java:183)
	at org.jboss.as.txn.subsystem.TransactionSubsystemRootResourceDefinition$DefaultTimeoutHandler.applyUpdateToRuntime(TransactionSubsystemRootResourceDefinition.java:499)
	at org.jboss.as.controller.AbstractWriteAttributeHandler$1.execute(AbstractWriteAttributeHandler.java:104)
	at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:982)
	at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:726)
	at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:450)
	at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1402)
	at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:418)
	at org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:243)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:263)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:229)
	at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:243)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.doExecute(ModelControllerClientOperationHandler.java:217)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.access$400(ModelControllerClientOperationHandler.java:137)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:161)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:157)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:287)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:244)
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:254)
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:225)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1.execute(ModelControllerClientOperationHandler.java:157)
	at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$1.doExecute(ManagementRequestContextImpl.java:70)
	at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$AsyncTaskRunner.run(ManagementRequestContextImpl.java:160)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
	at org.jboss.threads.JBossThread.run(JBossThread.java:320)

[standalone@localhost:9990 /] /subsystem=transactions:read-resource-description 
      ...(snip)...
            "default-timeout" => {
                "type" => INT,
                "description" => "The default timeout for a transaction managed by the transaction manager.",
                "expressions-allowed" => true,
                "required" => false,
                "nillable" => true,
                "default" => 300,
                "unit" => "SECONDS",
                "min" => 0L,
                "max" => 2147483647L,
                "access-type" => "read-write",
                "storage" => "configuration",
                "restart-required" => "no-services"
            },
      ...(snip)...

150     public static final SimpleAttributeDefinition DEFAULT_TIMEOUT = new SimpleAttributeDefinitionBuilder(CommonAttributes.DEFAULT_TIMEOUT, ModelType.INT, true)
151             .setValidator(new IntRangeValidator(0))          // <--- minimum is 0
152             .setMeasurementUnit(MeasurementUnit.SECONDS)
153             .setDefaultValue(new ModelNode().set(300))
154             .setFlags(AttributeAccess.Flag.RESTART_NONE)
155             .setXmlName(Attribute.DEFAULT_TIMEOUT.getLocalName())
156             .setAllowExpression(true).build();

176     /**
177      * Set the global default transaction timeout, returning the original value.
178      *
179      * @param newTimeout the new timeout value in seconds (must be >= 1)
180      * @return the previous timeout in seconds (>= 1)
181      */
182     public static int setGlobalDefaultTransactionTimeout(int newTimeout) { 
183         Assert.checkMinimumParameter("newTimeout", 1, newTimeout);          // <--- minimum is 1
184         final SecurityManager sm = System.getSecurityManager();
185         if (sm != null) {
186             sm.checkPermission(SET_TIMEOUT_PERMISSION);
187         }
188         return defaultTimeoutRef.getAndSet(newTimeout);
189     }