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This problem occurs when your android studio is not getting internet connection. : Connection refused: connect I use the following command to start the instance: java -Xms2048m -Xmx2024m -agentlib:jdwp=transport=dt_socket,address=10123,server=y,suspend=n -jar aem-author-p4502.jar My debug port is 10123 and I have "resolve sources when connecting" unchecked.. Jun 07, To debug on a hardware device connect to android device via usbip from WSL2 (thanks to @cjshearer): Connect USB device to WSL; Enable USB debugging on the device; Connect to android virtual device in Windows. FinallShellUbuntujava.net.ConnectException: Connection refused: connect. This problem occurs when your android studio is not getting internet connection. : Linux Ubuntu /etc/apt/sources.list ()ifconfignet-toolsvim( FinallShellUbuntujava.net.ConnectException: Connection refused: connect : Clicking on the link will direct to the : How to Fix java.net.ConnectException: Connection refused: connect in Java? 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Could not resolve com.android.tools.build:gradle:7.0.2Build Output SDK ToolsAndroid SDK Build-Toolsfile>settings>Appearance&Behavior>System Settings>Android SDK>SDK Toolsapp. Exception in thread main java.lang.ClassCastException: class java.math.BigDecimal cannot be cast to class java.lang.String (java.math.BigDecimal and java.lang.String are in module java.base of loader bootstrap) at Main.main(Main.java:11) We can fix the exception printing by means of converting the code in the below format: To debug on a hardware device connect to android device via usbip from WSL2 (thanks to @cjshearer): Connect USB device to WSL; Enable USB debugging on the device; Connect to android virtual device in Windows. Run java with the option -Djava.net.preferIPv4Stack=true to force java to use IPv4 instead of IPv6. There are mainly two types of exception in java as follows: 1. java.net.ConnectException: Connection refused: connect Failed to download any source lists! Android ECONNREFUSED() [] Android ECONNREFUSED (Connection refused) 696 2020/8/30 3:30:02 java android econnrefused Android ECONNREFUSED() java.net.ConnectExceptionConnection refused 4. Connection refused: connect I use the following command to start the instance: java -Xms2048m -Xmx2024m -agentlib:jdwp=transport=dt_socket,address=10123,server=y,suspend=n -jar aem-author-p4502.jar My debug port is 10123 and I have "resolve sources when connecting" unchecked.. Jun 07, : Linux Ubuntu /etc/apt/sources.list ()ifconfignet-toolsvim( On Linux, this could also be achieved by running (or placing it inside /etc/profile: export _JAVA_OPTIONS="-Djava.net.preferIPv4Stack=true" check Operating System proxy settings, firewalls and anti-virus programs : How to Fix java.lang.ClassCastException in TreeSet? We need to handle the exception carefully in order to fulfill the communication problem. 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Queries related to Unable to init server: Could not connect: Connection refused (gedit:76): Gtk-WARNING **: 15:50:34.452: cannot open display: with wslg java.net.sockettimeoutexception read timed out; kotlin not configured android studio; We need to handle the exception carefully in order to fulfill the communication problem. Could not resolve com.android.tools.build:gradle:7.0.2Build Output SDK ToolsAndroid SDK Build-Toolsfile>settings>Appearance&Behavior>System Settings>Android SDK>SDK Toolsapp. : : . FinallShellUbuntujava.net.ConnectException: Connection refused: connect. FinallShellUbuntujava.net.ConnectException: Connection refused: connect. FinallShellUbuntujava.net.ConnectException: Connection refused: connect. Connection refused: connect I use the following command to start the instance: java -Xms2048m -Xmx2024m -agentlib:jdwp=transport=dt_socket,address=10123,server=y,suspend=n -jar aem-author-p4502.jar My debug port is 10123 and I have "resolve sources when connecting" unchecked.. Jun 07, : . java.net.ConnectExceptionping 12, Apr 21. : Linux Ubuntu /etc/apt/sources.list ()ifconfignet-toolsvim( (jdk) 2.1 Cannot inline bytecode built with JVM target 1.8 Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target android { FinallShellUbuntujava.net.ConnectException: Connection refused: connect. 22, Jun 21. asn 1 decoder c. EXAMPLE 2. FinallShellUbuntujava.net.ConnectException: Connection refused: connect. 12, Apr 21. : . budongjiuwen518: . : . : FinallShellUbuntujava.net.ConnectException: Connection refused: connect. FinallShellUbuntujava.net.ConnectException: Connection refused: connect. 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On Linux, this could also be achieved by running (or placing it inside /etc/profile: export _JAVA_OPTIONS="-Djava.net.preferIPv4Stack=true" check Operating System proxy settings, firewalls and anti-virus programs wzdj456546: 70% To confirm the internet issue of the android studio you can attempt to login, update, connecting to firebase, etc all will fail. Redisjava.net.ConnectException: Connection refused:conn. java.net.ConnectExceptionConnection refused 4. To confirm the internet issue of the android studio you can attempt to login, update, connecting to firebase, etc all will fail. : . FinallShellUbuntujava.net.ConnectException: Connection refused: connect. FinallShellUbuntujava.net.ConnectException: Connection refused: connect Oracle12C. : FinallShellUbuntujava.net.ConnectException: Connection refused: connect. : Run java with the option -Djava.net.preferIPv4Stack=true to force java to use IPv4 instead of IPv6. 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