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digitalmars.D.learn - SegFault with HibernateD

reply Venkat <venkatram.akkineni gmail.com> writes:
I get a SegFault with the main method below which uses HibernateD 
. The second main method which uses ddbc just works fine. What is 
wrong with the first main method ? I have attached the error at 
the bottom although I don't think it says much.

This method uses HibernateD

int main() {
	// setup DB connection
	string url = MySQLDriver.generateUrl("localhost", 3306, "test");
	string[string] params = MySQLDriver.setUserAndPassword("test", 
"test");
	DataSource ds = new ConnectionPoolDataSourceImpl(new 
MySQLDriver(), url, params);

	// create metadata from annotations
	EntityMetaData schema = new SchemaInfoImpl!(Preferences);

	// create session factory
	Dialect dialect = new MySQLDialect();
	SessionFactory factory = new SessionFactoryImpl(schema, dialect, 
ds);
	scope(exit) factory.close();
	
	auto conn = ds.getConnection();
	scope(exit) conn.close();
	
	// create session
	Session sess = factory.openSession();
	scope(exit) sess.close();

	Query q = sess.createQuery("select p from Preferences p");
	Preferences[] list = q.list!Preferences();

	return 0;
}

The method below uses ddbc.

int main(string[] args) {

     string url = 
"mysql://localhost:3306/test?user=test,password=test";

     // creating Connection
     auto conn = createConnection(url);
     scope(exit) conn.close();

     // creating Statement
     auto stmt = conn.createStatement();
     scope(exit) stmt.close();

     // reading DB
     auto rs = stmt.executeQuery("SELECT * FROM preferences_wm 
ORDER BY id");
     writeln(rs.getFetchSize());
     return 0;
}


This is the error.

Running ./bin/hibernated-test
Program exited with code -11
Full exception: 
object.Exception source/dub/generators/build.d(530): Program 
exited with code -11
----------------
/home/vagrant/old-dmd/dmd2/linux/bin64/../../src/phobos/std/exception.d:420
pure  safe void std.exception.bailOut!(Exception).bailOut(immutable(char)[],
ulong, const(char[])) [0x8d036c]
/home/vagrant/old-dmd/dmd2/linux/bin64/../../src/phobos/std/exception.d:388
pure  safe bool std.exception.enforce!(Exception, bool).enforce(bool, lazy
const(char)[], immutable(char)[], ulong) [0x8defcd]
source/dub/generators/build.d:530 void 
dub.generators.build.BuildGenerator.runTarget(dub.internal.vibeco
pat.inet.path.Path, const(dub.compilers.buildsettings.BuildSettings),
immutable(char)[][], dub.generators.generator.GeneratorSettings) [0x97b1c9]
source/dub/generators/build.d:110 void 
dub.generators.build.BuildGenerator.performPostGenerateActions(dub.generators.generato
.GeneratorSettings, const(dub.generators.generator.ProjectGenerator.TargetInfo[
mmutable(char)[]])) [0x977541]
source/dub/generators/generator.d:118 void 
dub.generators.generator.ProjectGenerator.generate(dub.generators.generato
.GeneratorSettings) [0x9805a0]
source/dub/dub.d:494 void 
dub.dub.Dub.generateProject(immutable(char)[], 
dub.generators.generator.GeneratorSettings) [0x8918e0]
source/dub/commandline.d:789 int 
dub.commandline.GenerateCommand.execute(dub.dub.Dub, 
immutable(char)[][], immutable(char)[][]) [0x857579]
source/dub/commandline.d:821 int 
dub.commandline.BuildCommand.execute(dub.dub.Dub, 
immutable(char)[][], immutable(char)[][]) [0x857913]
source/dub/commandline.d:849 int 
dub.commandline.RunCommand.execute(dub.dub.Dub, 
immutable(char)[][], immutable(char)[][]) [0x857b23]
source/dub/commandline.d:239 int 
dub.commandline.runDubCommandLine(immutable(char)[][]) [0x853647]
source/app.d:14 _Dmain [0x84fc27]
Jan 11
parent reply Mike Parker <aldacron gmail.com> writes:
On Friday, 12 January 2018 at 05:24:52 UTC, Venkat wrote:
 I get a SegFault with the main method below which uses 
 HibernateD . The second main method which uses ddbc just works 
 fine. What is wrong with the first main method ? I have 
 attached the error at the bottom although I don't think it says 
 much.
 This is the error.
 object.Exception source/dub/generators/build.d(530): Program
It says enough to know that the exception is being thrown from dub and not your program. You program is never executed because dub throws the exception before it gets that far. You should report this at the dub repository: https://github.com/dlang/dub/issues
Jan 11
parent reply Rene Zwanenburg <renezwanenburg gmail.com> writes:
On Friday, 12 January 2018 at 07:33:37 UTC, Mike Parker wrote:
 On Friday, 12 January 2018 at 05:24:52 UTC, Venkat wrote:
 I get a SegFault with the main method below which uses 
 HibernateD . The second main method which uses ddbc just works 
 fine. What is wrong with the first main method ? I have 
 attached the error at the bottom although I don't think it 
 says much.
 This is the error.
 object.Exception source/dub/generators/build.d(530): Program
It says enough to know that the exception is being thrown from dub and not your program. You program is never executed because dub throws the exception before it gets that far. You should report this at the dub repository: https://github.com/dlang/dub/issues
It looks to me like the program is being run through dub, and dub is just reporting the program's exit code. Hard to guess what the issue is, I'd attach a debugger to see where it crashes.
Jan 12
next sibling parent reply Mike Parker <aldacron gmail.com> writes:
On Friday, 12 January 2018 at 08:55:13 UTC, Rene Zwanenburg wrote:
 It looks to me like the program is being run through dub, and 
 dub is just reporting the program's exit code.
I see now. I glossed right over that execution output. On Windows, I don't recall ever seeing a dub exception from dub from a segfault. Just checked by accessing a null pointer and there's nothing thrown from dub. Is that a Linux thing?
Jan 12
parent Venkat <venkatram.akkineni gmail.com> writes:
On Friday, 12 January 2018 at 12:41:34 UTC, Mike Parker wrote:
 I see now. I glossed right over that execution output. On 
 Windows, I don't recall ever seeing a dub exception from dub 
 from a segfault. Just checked by accessing a null pointer and 
 there's nothing thrown from dub. Is that a Linux thing?
Thankyou for the reply. Yes I am running the app on Linux. I will report the issue.
Jan 12
prev sibling parent reply Venkat <venkatram.akkineni gmail.com> writes:
On Friday, 12 January 2018 at 08:55:13 UTC, Rene Zwanenburg wrote:
 Hard to guess what the issue is, I'd attach a debugger to see 
 where it crashes.
It fails at the sql() method in Command struct in mysql-native-1.1.4/mysql-native/source/mysql/commands.d. This is what gdb says when I do a disp _sql. 1: _sql = <error: Cannot access memory at address 0x8> I'm sorry I am new to systems programming, would that mean _sql is null ?
Jan 12
parent reply Venkat <venkatram.akkineni gmail.com> writes:
I think there is a bug with PreparedStatement class in 
HibernateD. ddbc fails when I use a PreparedStatement. The code 
below shows that. I will create an issue with HibernateD.


int main(string[] args) {

     string url = 
"mysql://localhost:3306/webmarx?user=webmarx_dev,password=webm rx";

     // creating Connection
     auto conn = createConnection(url);
     scope(exit) conn.close();

     // creating Statement
     auto stmt = conn.createStatement();
     scope(exit) stmt.close();

      PreparedStatement prepStatement = 
conn.prepareStatement("SELECT * FROM preferences_wm ORDER BY id");
      scope(exit) prepStatement.close();
      ResultSet rs = prepStatement.executeQuery();

     writeln(rs.getFetchSize());
     return 0;
}
Jan 12
parent reply Venkat <venkatram.akkineni gmail.com> writes:
Sorry about all these posts. Wish there were an edit button. I 
meant PreparedStatement in mysqlddbc driver, not HibernateD.
Jan 12
parent reply =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 01/12/2018 06:50 PM, Venkat wrote:
 Sorry about all these posts. Wish there were an edit button.
That's ok. :) These are actually newsgroups (see NNTP protocol). Newsgroups don't have any edit functionality. The "forum" is just a web interface to newsgroups. Ali
Jan 12
parent Venkat <venkatram.akkineni gmail.com> writes:
On Saturday, 13 January 2018 at 06:18:43 UTC, Ali Çehreli wrote:
 On 01/12/2018 06:50 PM, Venkat wrote:
 Sorry about all these posts. Wish there were an edit button.
That's ok. :) These are actually newsgroups (see NNTP protocol). Newsgroups don't have any edit functionality. The "forum" is just a web interface to newsgroups. Ali
Oh! ok, that makes sense. TY.
Jan 14