jcall: Same as .jcall but with check = FALSE as default
In hoesler/dbj: Provides access to databases through the JDBC interface

Same as .jcall but with check = FALSE as default

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jcall(obj, returnSig = "V", method, ..., evalArray = TRUE,
  evalString = TRUE, check = FALSE, interface = "RcallMethod",
  simplify = FALSE, use.true.class = FALSE)

`obj`	Java object (`jobjRef` as returned by `.jcall` or `.jnew`) or fully qualified class name in JNI notation (e.g. `"java/lang/String"`).
`returnSig`	Return signature in JNI notation (e.g. "V" for void, "[I" for `int[]` etc.). For convenience additional type `"S"` is supported and expanded to `"Ljava/lang/String;"`, re-mapping `"T"` to represent the type `short`.
`method`	The name of the method to be called
`...`	Any parametes that will be passed to the Java method. The parameter types are determined automatically and/or taken from the `jobjRef` object. All named parameters are discarded.
`evalArray`	This flag determines whether the array return value is evaluated (`TRUE`) or passed back as Java object reference (`FALSE`).
`evalString`	This flag determines whether string result is returned as characters or as Java object reference.
`check`	If set to `TRUE` then checks for exceptions are performed before and after the call using `.jcheck(silent=FALSE)`. This is usually the desired behavior, because all calls fail until an expection is cleared.
`interface`	This option is experimental and specifies the interface used for calling the Java method; the current implementation supports two interfaces: `"RcallMethod"`the default interface. `"RcallSyncMethod"`synchronized call of a method. This has simmilar effect as using `synchronize` in Java.
`simplify`	If `evalArray` is `TRUE` then this argument is passed to `.jevalArray()`.
`use.true.class`	logical. If set to `TRUE`, the true class of the returned object will be used instead of the declared signature. `TRUE` allows for example to grab the actual class of an object when the return type is an interface, or allows to grab an array when the declared type is Object and the returned object is an array. Use `FALSE` for efficiency when you are sure about the return type.