The "illegal start of expression" fault is a compile fourth dimension fault when the compiler finds an inappropriate disputation inwards the code. The coffee compiler, javac, compiles your source code from give to bottom, left to correct in addition to when it sees something inappropriate at the start of an expression, it throws "illegal start of expression" error. The most mutual argue of this is a missing semi-colon. You mightiness know that every disputation inwards Java ends alongside a semicolon, but if you lot forget one, you lot won't larn an fault that in that location is a missing semi-colon at the terminate of disputation because the compiler doesn't know the end. When compiler checks the adjacent disputation it sees illegal start because an before disputation was non terminated. The bad business office is that you lot tin larn tens of "illegal start of expression" fault past times simply omitting a unmarried semi-colon or missing braces, every bit shown inwards the next example.
If you lot compile this plan you lot volition survive greeted alongside several "illegal start of expression" fault every bit shown below:
$ javac Main.java
Main.java:7: error: illegal start of expression
populace static int count() {
^
Main.java:7: error: illegal start of expression
populace static int count() {
^
Main.java:7: error: ';' expected
populace static int count() {
^
Main.java:7: error: ';' expected
populace static int count() {
^
Main.java:11: error: reached terminate of file spell parsing
}
^
five errors
And the alone work is a missing braces inwards principal method, every bit before long every bit you lot add together that missing closing curly span inwards principal method the code volition move fine in addition to all these fault volition become away, every bit shown below:
The fault message is really interesting, if you lot appear at the get-go one, you lot volition notice that fault is inwards work vii in addition to compiler complaing virtually public keyword but actual work was inwards work five where a closing span is missing. From compiler's view, public should non come upwards in that location becase its an invalid keyword within a method inwards Java, shout out back without closing braces main() is yet non closed, in addition to then compiler think public keyword is business office of the main() method.
Though, when you lot compile the same plan inwards Eclipse, you lot larn dissimilar fault because it's compiler is slightly differnet than javac but the fault message is to a greater extent than helpful every bit you lot tin run across below:
Exception inwards thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error, insert "}" to consummate MethodBody
at Main.main(Main.java:4)
In short, the "illegal start of expression" fault agency compiler notice something inappropriate, against the rules of Java programming but the fault message is non really helpful. For "illegal start of expression" errors, endeavour looking at the lines preceding the fault for a missing ')' or '}' or missing semicolon. Also remember, a unmarried syntax fault somewhere tin displace multiple "illegal start of expression" error. Once you lot make the beginning cause, all fault volition become away. Which agency e'er recompile 1 time you lot make an error, don't endeavour to brand multiple changes without compilation.
Other Java troubleshooting guides you lot may like:
public class Main { public static void main(String[] args) { count(); public static int count() { return 0; } }
If you lot compile this plan you lot volition survive greeted alongside several "illegal start of expression" fault every bit shown below:
$ javac Main.java
Main.java:7: error: illegal start of expression
populace static int count() {
^
Main.java:7: error: illegal start of expression
populace static int count() {
^
Main.java:7: error: ';' expected
populace static int count() {
^
Main.java:7: error: ';' expected
populace static int count() {
^
Main.java:11: error: reached terminate of file spell parsing
}
^
five errors
And the alone work is a missing braces inwards principal method, every bit before long every bit you lot add together that missing closing curly span inwards principal method the code volition move fine in addition to all these fault volition become away, every bit shown below:
The fault message is really interesting, if you lot appear at the get-go one, you lot volition notice that fault is inwards work vii in addition to compiler complaing virtually public keyword but actual work was inwards work five where a closing span is missing. From compiler's view, public should non come upwards in that location becase its an invalid keyword within a method inwards Java, shout out back without closing braces main() is yet non closed, in addition to then compiler think public keyword is business office of the main() method.
Though, when you lot compile the same plan inwards Eclipse, you lot larn dissimilar fault because it's compiler is slightly differnet than javac but the fault message is to a greater extent than helpful every bit you lot tin run across below:
Exception inwards thread "main" java.lang.Error: Unresolved compilation problem:
Syntax error, insert "}" to consummate MethodBody
at Main.main(Main.java:4)
In short, the "illegal start of expression" fault agency compiler notice something inappropriate, against the rules of Java programming but the fault message is non really helpful. For "illegal start of expression" errors, endeavour looking at the lines preceding the fault for a missing ')' or '}' or missing semicolon. Also remember, a unmarried syntax fault somewhere tin displace multiple "illegal start of expression" error. Once you lot make the beginning cause, all fault volition become away. Which agency e'er recompile 1 time you lot make an error, don't endeavour to brand multiple changes without compilation.
Other Java troubleshooting guides you lot may like:
- How to make "variable mightiness non accept been initialized" fault inwards Java? (solution)
- Could non make the Java virtual machine Invalid maximum heap size: -Xmx (solution)
- How to make class, enum, or interface expected fault inwards Java? (solution)
- How to make java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory (solution)
- Caused By: java.lang.NoClassDefFoundError: org/apache/log4j/Logger inwards Java (solution)
- Error: could not open 'C:\Java\jre8\lib\amd64\jvm.cfg' (solution)
- java.lang.OutOfMemoryError: Java heap infinite : Cause in addition to Solution (steps)
- How to avoid ConcurrentModificationException spell looping over List inwards Java? (solution)
References
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