Problems compiling any java code in Eclipse

Question

I am new to the java world and starting some online tutorials. Everything was great, and the programs compiled fine, and then suddenly, without me, seemingly without changing anything, since the preferences directly attributed to Eclipse stopped compiling any code. Even simple Hello World code will not compile. All that I get in the console line for any code:

Usage: javaw [-options] class [args...] (to execute a class) or javaw [-options] -jar jarfile [args...] (to execute a jar file) where options include: -d32 use a 32-bit data model if available -d64 use a 64-bit data model if available -server to select the "server" VM -hotspot is a synonym for the "server" VM [deprecated] The default VM is server. -cp <class search path of directories and zip/jar files> -classpath <class search path of directories and zip/jar files> A ; separated list of directories, JAR archives, and ZIP archives to search for class files. -D<name>=<value> set a system property -verbose[:class|gc|jni] enable verbose output -version print product version and exit -version:<value> require the specified version to run -showversion print product version and continue -jre-restrict-search | -no-jre-restrict-search include/exclude user private JREs in the version search -? -help print this help message -X print help on non-standard options -ea[:<packagename>...|:<classname>] -enableassertions[:<packagename>...|:<classname>] enable assertions with specified granularity -da[:<packagename>...|:<classname>] -disableassertions[:<packagename>...|:<classname>] disable assertions with specified granularity -esa | -enablesystemassertions enable system assertions -dsa | -disablesystemassertions disable system assertions -agentlib:<libname>[=<options>] load native agent library <libname>, eg -agentlib:hprof see also, -agentlib:jdwp=help and -agentlib:hprof=help -agentpath:<pathname>[=<options>] load native agent library by full pathname -javaagent:<jarpath>[=<options>] load Java programming language agent, see java.lang.instrument -splash:<imagepath> show splash screen with specified image 

See http://www.oracle.com/technetwork/java/javase/documentation/index.html for details.

I’m not quite sure what it is and why he started to do it. How can I fix the compiler to continue learning?

Answer 1

I also had this problem. Try restarting Eclipse. If this does not work, restart the computer. If even this does not work, reinstall Java. Its an annoying error that usually occurs when your computer goes into standby mode when the program is running on Eclipse.

EDIT: if the problem persists, you can create a small javac program that compiles any code in this directory.

I hope I helped!

Answer 2

This is because you did not install the JDK, but only the JRE. Install JDK for it to work.

A source