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org . SMS lib . gateway exception:Comm library exception:Java . lang . reflect . invocationtargetexception

I also encountered this exception today, because I turned on the HyperTerminal (sending AT instructions) to send short messages before testing with java code, and forgot to turn off and turn off the HyperTerminal after testing with Java code, so that the HyperTerminal will always occupy this COM port, so the above exception will appear, but it will not appear after disconnecting the HyperTerminal and sending with Java code.