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How to fix "illegal start of expression" fault in Java? Example

The "illegal outset of expression" mistake is a compile-time fault when the compiler finds an inappropriate statement in the code. The java compiler, javac , compile your source lawmaking from pinnacle to bottom, left to correct and when it sees something inappropriate at the start of an expression, it throws an"illegal showtime of expression" error. The most mutual reason for this is a missing semi-colon. You might know that every argument in Java ends with a semicolon, but if y'all forget one, y'all won't get an error that at that place is a missing semi-colon at the finish of the statement considering the compiler doesn't know the end.

When the compiler checks the next statement it sees an illegal get-go because an earlier statement was not terminated. The bad function is that you tin get tens of "illegal start of expression" errors past merely omitting a single semi-colon or missing braces, every bit shown in the following example.

                public                class                Main                {                public                static                void                main(String[] args) {     count();                public                static                int                count() {                return                0;   }  }

If you compile this programme you will be greeted with several "illegal start of expression" error every bit shown below:

$ javac Chief.java
Main.java:7: error: illegal start of expression
public static int count() {
^
Main.coffee:seven: fault: illegal start of expression
public static int count() {
^
Main.java:7: error: ';' expected
public static int count() {
^
Main.java:7: error: ';' expected
public static int count() {
^
Main.java:11: error: reached end of file while parsing
}
^
5 errors

And the only problem ismissing braces in the main method, every bit soon as yous add that missing closing curly brace in the primary method the code will work fine and all these errors will go away, as shown below:

The error message is very interesting, if y'all expect at the first ane, y'all will notice that mistake is in line seven and the compiler complaining about a public keyword simply the bodily problem was in line 5 where a closing brace is missing.

From the compiler'due south view, thepublic should not come in that location because it's an invalid keyword inside a method in Java, recollect without closing braces main() is still not closed, so the compiler thinks thepublic keyword is office of the main() method.

Though, when yous compile the same program in Eclipse, you get a different error because its the compiler is slightly dissimilar than javac but the error message is more helpful as y'all can run into below:

Exception in thread "main" java.lang.Fault: Unresolved compilation trouble:
Syntax error, insert "}" to consummate MethodBody

at Chief.main(Main.coffee:4)

In short, the "illegal starting time of expression" error means the compiler find something inappropriate, against the rules of Coffee programming simply the error message is not very helpful. For "illegal kickoff of expression" errors, endeavor looking at the lines preceding the error for a missing ')' or '}' or missing semicolon.

Also remember, a single syntax error somewhere can crusade multiple "illegal start of expression" errors. Once y'all ready the root cause, all errors will go abroad. This means ever recompile once yous fix an fault, don't try to make multiple changes without compilation.

Other Java troubleshooting guides you may like:

• How to set "variable might not have been initialized" error in Coffee? (solution)
• Could not create the Java virtual machine Invalid maximum heap size: -Xmx (solution)
• How to ready class, enum, or interface expected mistake in Java? (solution)
• How to gear up java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory (solution)
• Caused Past: java.lang.NoClassDefFoundError: org/apache/log4j/Logger in Java (solution)
• Fault: could nonopen 'C:\Java\jre8\lib\amd64\jvm.cfg' (solution)
• java.lang.OutOfMemoryError: Java heap infinite : Cause and Solution (steps)
• How to avoid ConcurrentModificationException while looping over List in Java? (solution)

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Source: https://www.java67.com/2016/08/how-to-fix-illegal-start-of-expression-error-in-java.html

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