[英]Java classpath fails but eclipse works
When I run code that uses a sql driver for jbdc it works on eclipse. 当我运行将SQL驱动程序用于jbdc的代码时,它将在eclipse上运行。 This is after I went into the project properties and added the external jar.
这是在我进入项目属性并添加了外部jar之后的。 However when I run the following from the command line it fails.
但是,当我从命令行运行以下命令时,它将失败。
java -version
java version "1.8.0_25"
javac sql_stuff.java
java sql_stuff -classpath conn.jar
java.sql.SQLException: No suitable driver found for jdbc:mysql://...
Same with -cp 与-cp相同
javac sql_stuff.java
java sql_stuff -cp conn.jar
In Eclipse all I had to do is go project > Properties > Java Build Path > Libraries and add the jar file. 在Eclipse中,我要做的就是转到项目>属性> Java构建路径>库,然后添加jar文件。
Edit 编辑
Got it finally running with 终于有了运行
java -cp .:conn.jar sqlstuff
Java seems to need to 're-add' a class path (even though it was '.' !!!) otherwise it wouldn't find the class. Java似乎需要“重新添加”类路径(即使它是“。” !!!),否则它将找不到该类。 Also you have to use : as a separator (or sometimes ; ), god knows why.
您还必须使用:作为分隔符(有时是;),上帝知道原因。 Hopefully this will help others when they stumble across issues.
希望这对其他人偶然发现问题会有所帮助。
When you run the java
command, all the "switches" (things starting with -) that come before the class name are considered arguments to the JVM. 当您运行
java
命令时,类名之前的所有“开关”(以-开头的东西)都被视为JVM的参数。 All those that come after the class name are considered arguments to the main
method in the class. 所有在类名之后的那些都被视为类中
main
方法的参数。
So the command line: 因此,命令行:
java ClassName -cp conn.jar
Will be interpreted as "run with no JVM arguments, passing the array { "-cp", "conn.jar" }
as args
to main
. 将被解释为“运行时没有JVM参数,将数组
{ "-cp", "conn.jar" }
作为args
传递给main
。
While the command line: 而在命令行中:
java -cp conn.jar ClassName
Will be interpreted as "run with a classpath of conn.jar
, and call main
in ClassName
with an empty args
array". 将被解释为“使用
conn.jar
的类路径运行,并使用空的args
数组调用ClassName
main
”。
So always remember to pass all JVM arguments, including the classpath, before the name of the class. 因此,请始终记住在类名之前传递所有JVM参数,包括类路径。
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