java - Differences when running Tomcat from within Intellij IDEA? -

-

i have bizarre problem spring 3.5, webflow 2.2 application, running in tomcat (6.0.32)

part of webflow calls retrieve list of objects. list placed in viewscope object use jsp view. each object in list inherits base class contains common fields.

the webflow forwards jsp view displays contents of list, writing out objects.

when run stand-alone tomcat, fields on base class somehow set null. have debugged , confirmed list built correctly code called webflow . somewhere between putting list webflow view scope, , later being retrieved jsp, base class fields being reset null.

the bizarre part of problem app runs if start , run tomcat within intellij idea. i've tried various jdks , tomcat versions, , have same issue.

it appears webflow problem (improper serialization maybe?) that's sensitive whether tomcat has been started within intellij.

what intellij doing cause java serialization misbehave?

well, haven't found exact underlying cause, have work-around. implemented custom object serialization methods - private void writeobject() , readobject() - on objects being mysteriously not serialized properly, , started working. there couple of simple types (couple of longs , string) in base class, it's nothing complex.

just clarify (in case 1 interessted) - had data object used form in web-app. object contains map of attribute objects, each attribute object based on class hierarchy this:

attribute class -> shared base class -> root base class

all data gets persisted byte-array spring web-flow, un-persisted when web-flow calls view. in case, fields of root base class not being persisted default mechanism.

i still don't know exactly why though. , still don't know why, when started tomcat within intellij, serialization worked expected. strange.

update: found culprit. bad ant build script hiding missing "serializable" interface marker.

the system in question quite large, , has nasty, hard-to-follow ant build script. i'd assumed doing full, proper clean build. in class hierarchy showed above, attribute class , root base class in different jars. , jar containing root base class in fact being cached , not rebuilt properly.

the older (incorrect) version of base class being deployed did not have "serializable" marker interface (the attribute class did). of course, fields not being serialized. when tested within intellij, doing build , deploy directly sources.

i feel dumb now.


Comments

Post a Comment

Popular posts from this blog

php - What is the difference between $_SERVER['PATH_INFO'] and $_SERVER['ORIG_PATH_INFO']? -

-
what’s difference between $_server['path_info'] , $_server['orig_path_info'] ? how use them? when run print_r($_server) , path_info , orig_path_info not present in array. why not? how can enable them? i have read php manual on them, still don’t understand them. the path_info variable present if invoke php script this: http://www.example.com/phpinfo.php/hello_there it's /hello_there part after .php script. if don't invoke url that, there won't $_server["path_info"] environment variable. the porig_ prefix uncommon. path_info standard cgi-environment variable, , should never prefixed. did read that? (there issues around php3/php4 if invoked php interpreter via cgi-bin/ - hardly has such setups today.) for reference: http://www.ietf.org/rfc/rfc3875
Read more

fortran - Function return type mismatch -

-
i'm attempting recode old c++ program in fortran make use of lapack (i'm aware c++ have lapack++, i'm having lot of trouble installing it, gave up). i didn't have problems compilation, when had variables declared real . when started coding section of program required lapack, found parameters passed dsyev need double precision . tried change double precision (including changing hard coded numbers double precision counterparts, i.e. 0.0 -> 0.0d0) when try compile, following error of functions , subroutines i've written: error: return type mismatch of function <function> @ (1) (real(4)/real(8)) i'm not sure coming from, in program has been changed double precision. for example, i've declared following: double precision :: alpha(3),d(3),zeta1,zeta2 double precision :: a1(3),a2(3),d1(3),d2(3) double precision :: pi pi = 3.14159265359d0 alpha = (/0.109818d0, 0.405771d0, 2.22766d0/) d = (/0.444635d0, 0.535328d0, 0.154329d0 /) 10 i=1,3 ...
Read more

queue - mq_receive: message too long -

-
i implementing communication between 2 processes using queue. problem when call function mq_receive, error: message long. i have done following: struct mq_attr attr; long size = attr.mq_msgsize; .... // initializing queue "/gateway" int rc = mq_receive(gateway, buffer, size, &prio); if print size value, size=1, while when print same size program (got same mechanism), not long integer ( -1217186280 )... how can solve error?....so while size = 1, believe it's right "message long" why 1? p.s. have tried put : int rc = mq_receive(gateway, buffer, sizeof(buffer), &prio); but no result. it seems need read docs more carefully. when call mq_receive should pass size of destination buffer. this size must greater mq_msgsize attribute of queue . in addition, seems have error in queue attributes initialisation makes proper mq_receive call impossible. here standard message queue session: fill mq_attr struct ( doc ): struct mq_a...
Read more