我试图从串行和春季启动中读取数据，以便可以从Arduino读取数据，所以我使用了这段代码
package com.example.databasedemo;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.Enumeration;
public class SerialTest implements SerialPortEventListener {
SerialPort serialPort;
/** The port we're normally going to use. */
private static final String PORT_NAMES[] = { "/dev/tty.usbserial-A9007UX1", // Mac OS X
"/dev/ttyUSB0", // Linux
"COM4", // Windows
};
private BufferedReader input;
private OutputStream output;
private static final int TIME_OUT = 2000;
private static final int DATA_RATE = 9600;
public void initialize() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
//First, Find an instance of serial port as set in PORT_NAMES.
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
for (String portName : PORT_NAMES) {
if (currPortId.getName().equals(portName)) {
portId = currPortId;
break;
}
}
}
if (portId == null) {
System.out.println("Could not find COM port.");
return;
}
try {
serialPort = (SerialPort) portId.open(this.getClass().getName(),
TIME_OUT);
serialPort.setSerialPortParams(DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
// open the streams
input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
output = serialPort.getOutputStream();
serialPort.addEventListener(this);
serialPort.notifyOnDataAvailable(true);
} catch (Exception e) {
System.err.println(e.toString());
}
}
public synchronized void close() {
if (serialPort != null) {
serialPort.removeEventListener();
serialPort.close();
}
}
public synchronized void serialEvent(SerialPortEvent oEvent) {
if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
try {
String inputLine=null;
if (input.ready()) {
inputLine = input.readLine();
System.out.println(inputLine);
}
} catch (Exception e) {
System.err.println(e.toString());
}
}}
public static void main(String[] args) throws Exception {
SerialTest main = new SerialTest();
main.initialize();
Thread t=new Thread() {
public void run() {
//the following line will keep this app alive for 1000 seconds,
//waiting for events to occur and responding to them (printing incoming messages to console).
try {Thread.sleep(1000000);} catch (InterruptedException ie) {}
}
};
t.start();
System.out.println("Started");
}
}
但是当我运行应用程序（如果arduino正在运行字符串启动）时，出现此错误：
#
# An error report file with more information is saved as:
# C:\Users\ELA_HIDRI\IdeaProjects\databasedemo\hs_err_pid12940.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
Process finished with exit code 1
，以及当Spring Boot运行Arduino时 给我这个错误
avrdude: ser_open(): can't open device "\\.\COM4": Access is denied.
我没有找到一种方法来解决它，当第一个正在读取另一个时，另一个被阻塞了，而另一个正在发送时，另一个人却被阻塞了。
这是我无法发布的文件，太大了
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000180003990, pid=23176, tid=6896
#
# JRE version: Java(TM) SE Runtime Environment (11.0+28) (build 11+28)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (11+28, mixed mode, tiered, compressed oops, g1 gc, windows-amd64)
# Problematic frame:
# C [rxtxSerial.dll+0x3990]
#
# No core dump will be written. Minidumps are not enabled by default on client versions of Windows
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
--------------- S U M M A R Y ------------
Command Line: -Djava.library.path=C:\Users\ELA_HIDRI\Desktop -javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.1.2\lib\idea_rt.jar=55606:C:\Program Files\JetBrains\IntelliJ IDEA 2019.1.2\bin -Dfile.encoding=UTF-8 com.example.databasedemo.SerialTest
Host: Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz, 4 cores, 7G, Windows 10 , 64 bit Build 17763 (10.0.17763.475)
Time: Sun Jun 23 22:18:34 2019 W. Central Africa Standard Time elapsed time: 1 seconds (0d 0h 0m 1s)
--------------- T H R E A D ---------------
Current thread (0x000001599e5af000): JavaThread "Thread-0" [_thread_in_native, id=6896, stack(0x00000053b3500000,0x00000053b3600000)]
Stack: [0x00000053b3500000,0x00000053b3600000], sp=0x00000053b35fe320, free space=1016k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native
code)
C [rxtxSerial.dll+0x3990]
Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j gnu.io.RXTXPort.readArray([BII)I+0
j gnu.io.RXTXPort$SerialInputStream.read([BII)I+212
j sun.nio.cs.StreamDecoder.readBytes()I+135 java.base@11
j sun.nio.cs.StreamDecoder.implRead([CII)I+112 java.base@11
j sun.nio.cs.StreamDecoder.read([CII)I+180 java.base@11
j java.io.InputStreamReader.read([CII)I+7 java.base@11
j java.io.BufferedReader.fill()V+145 java.base@11
j java.io.BufferedReader.readLine(Z)Ljava/lang/String;+44 java.base@11
j java.io.BufferedReader.readLine()Ljava/lang/String;+2 java.base@11
j com.example.databasedemo.SerialTest.serialEvent(Lgnu/io/SerialPortEvent;)V+24
j gnu.io.RXTXPort.sendEvent(IZ)Z+382
v ~StubRoutines::call_stub
j gnu.io.RXTXPort.eventLoop()V+0
j gnu.io.RXTXPort$MonitorThread.run()V+12
v ~StubRoutines::call_stub
siginfo: EXCEPTION_ACCESS_VIOLATION (0xc0000005), reading address 0xffffffffb35ff158
Register to memory mapping:
RIP=0x0000000180003990 rxtxSerial.dll
RAX=
[error occurred during error reporting (printing register info), id 0xc0000005, EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffbb1654d76]