com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Cannot load connection class because of underlying exception: 'java.lang.NumberFormatException: For input string: "null"'.

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You try to parse a String that contains non-numeric characters to an int. The string must contain decimal characters only, optionally beginning with a + or - sign.

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Can occur when you try to convert a String to a numeric value but the String is not well formatted for the conversion.

Solutions on the web

via bukkit.org by Unknown author, 1 year ago
Cannot load connection class because of underlying exception: 'java.lang.NumberFormatException: For input string: "null"'.
via GitHub by elipoke
, 3 months ago
Cannot load connection class because of underlying exception: 'java.lang.NumberFormatException: For input string: "null"'.
via Stack Overflow by Unknown author, 2 years ago
No operations allowed after connection closed.
via wampserver.com by Unknown author, 1 year ago
Could not create connection to database server. Attempted reconnect 3 times. Giving up.
via GitHub by piedrahitac
, 2 years ago
No operations allowed after connection closed.
java.lang.NumberFormatException: For input string: "null"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at com.mysql.jdbc.NonRegisteringDriver.port(NonRegisteringDriver.java:831)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at code.husky.mysql.MySQL.openConnection(MySQL.java:58)
at me.flamboo.WebbedMCAuth.Main.setupDB(Main.java:123)
at me.flamboo.WebbedMCAuth.Main.onEnable(Main.java:60)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:356)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:316)
at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:418)
at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:382)
at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:337)
at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:256)
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:528)
at java.lang.Thread.run(Thread.java:745)

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