Creating new java.sql.Date using rJava

Question

I've tried the following: .jnew("java/sql/Date", 1912324L)) (using the rJava package) and get the following:

Error in .jnew("java/sql/Date", 1912324L) : java.lang.NoSuchMethodError:

Same error when I try .jnew("java/util/Date", 1912324L).

Any ideas about why this is happening?

NB: This works fine .jnew("java/lang/String", "s")

Obligatory session_info():

Session info --------------------------------------------------------------------------------------
 setting  value                       
 version  R version 3.2.1 (2015-06-18)
 system   x86_64, darwin14.4.0        
 ui       RStudio (0.99.441)          
 language (EN)                        
 collate  en_AU.UTF-8                 
 tz       Australia/Sydney            

Packages ------------------------------------------------------------------------------------------
 package   * version date       source        
 crayon      1.3.0   2015-06-05 CRAN (R 3.2.1)
 curl        0.9     2015-06-19 CRAN (R 3.2.1)
 devtools  * 1.8.0   2015-05-09 CRAN (R 3.2.1)
 digest      0.6.8   2014-12-31 CRAN (R 3.2.1)
 git2r       0.10.1  2015-05-07 CRAN (R 3.2.1)
 memoise     0.2.1   2014-04-22 CRAN (R 3.2.1)
 Rcpp        0.11.6  2015-05-01 CRAN (R 3.2.1)
 rJava     * 0.9-6   2013-12-24 CRAN (R 3.2.1)
 rversions   1.0.1   2015-06-06 CRAN (R 3.2.1)
 testthat  * 0.10.0  2015-05-22 CRAN (R 3.2.1)
 xml2        0.1.1   2015-06-02 CRAN (R 3.2.1)

And...running Java 1.6:

java version "1.6.0_65"
Java(TM) SE Runtime Environment (build 1.6.0_65-b14-466.1-11M4716)
Java HotSpot(TM) 64-Bit Server VM (build 20.65-b04-466.1, mixed mode)

The constructor of Date takes a long and you are passing an int. The other (deprecated) constructor works: .jnew("java/sql/Date", 115L,11L,10L). — nicola
– nicola, Commented Jun 23, 2015 at 11:26

nicola · Accepted Answer · 2015-06-23 11:36:24Z

5

The constructor of java.sql.Date takes a long as argument and you are passing an int instead. Since R doesn't have native float and long types, rJava provides the .jfloat and .jlong functions to convert numeric R vectors. This works:

.jnew("java/sql/Date", .jlong(1912324))

Keep in mind that you have to provide the number of milliseconds from the 1970-01-01, so it's highly unlikely that the value you provided is what you intend.

answered Jun 23, 2015 at 11:36

nicola

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